 SEMATHS.ORG

# Popular questions

#### What is expansion diffusion

Expansion diffusion is when innovations spread to new places while staying strong in their original locations. For example, Islam has spread th...

#### What is 250 as a decimal

250% = 2.5 in decimal form....

#### Why is the acceleration due to gravity the same for all objects

As such, all objects free fall at the same rate regardless of their mass. Because the 9.8 N/kg gravitational field at Earth's sur...

#### What is tangent of an angle

The tangent of an angle is the trigonometric ratio between the adjacent side and the opposite side of a right triangle containing that angle...

#### When is a limit undefined

Lesson Summary Some limits in calculus are undefined because the function doesn't approach a finite value. The following limits a...

#### How many sq ft in a football field

Basically if you can picture a football field, that's pretty close to an acre in size. Officially, it is 43,560 square feet, and a fo...

#### What is a good reaction time

The average (median) reaction time is 215 milliseconds, according to the data collected so far. In addition to measuring your reaction time<...

#### What is the probability of rolling an even number on a six sided dice

For example, the probability of rolling an even number on a 6-sided die is 3/6 = 1/2....

#### In which of these quadrilaterals are the angles always congruent

A rectangle also has the special characteristic that all of its angles are right angles; all four of its angles are congruent. The other...

#### How many isotopes does platinum have

There are six naturally occurring isotopes : the most abundant are platinum-194, which accounts for 33%, platinum-195 (34%) and platinum...

#### How to find foci ellipse

actually an ellipse is determine by its foci. But if you want to determine the foci you can use the lengths of the ...

#### How to find perfect square factors

The prime factors of N = 100 are 2, 2, 5, 5. Therefore, the number of factors that are perfect square are (1 + 2/2) * (1 + 2/2) =...

#### How to calculate area of four different sides

Use the following equation: Area = side × side or A = s. Example: If one side of a square has a length of 4...

#### What is the midpoint of a line segment

The midpoint is halfway between the two end points: Its x value is halfway between the two x values. Its y value is halfway between the two y v...

#### What does the word and mean in math

The multiplication principle stated in the previous lesson relies on actions being independent, that the outcome of one action can in no way affect th...

#### What shape is a kite

Explanation: A kite is a four-sided shape with straight sides that has two pairs of sides. Each pair of adjacent sides are equal ...

#### How to solve implicit equations

To solve a system of implicit equations, type the equations as they appear in the problem with one equation per line. If n...

#### How is photosynthesis similar in c4 plants and cam plants

ATP and NADPH. How is photosynthesis similar in C4 plants and CAM plants? In both cases, rubisco is not used to fix carbon initially. ATP and ...

#### What does a 0 exponent mean

The zero exponent rule states that any nonzero number raised to a power of zero equals one....

#### How to play breakout

Head to Google Images and type “Atari breakout” to fire up “Image Breakout” and start destroying rows of images by bouncing a ba...

#### How are centuries determined

A century is defined as a 100 year period. The years we are in is always one behind the century number. This is because it takes 100 ye...

#### Which years were leap years

Therefore, the year 2000 will be a leap year, but the years 1700, 1800, and 1900 were not. The complete list of leap ye...

#### How to write two thirds

For example, you can write two-thirds in fractional form – 2/3 – or as a decimal – 0.667 – and either way, you calculate two<...

#### How many angles does a trapezoid have

The degree measure of the four angles add up to 360 degrees. This is actually true of any quadrilateral. Let lower case letters a, b, c and d r...

#### What is the number before infinity

converges to infinity, then we can establish another sequence of (n-1) for all n inside N, which would be {0,1,2,3}. This would also converge t...

#### How does standard deviation change when multiplying by a constant

Standard Deviation Standard deviation. Adding or subtracting a constant from the scores does not change the sta...

#### What are numbers with decimals called

The numbers expressed in the decimal form are called decimal numbers or decimals. For example: 5.1, 4.09, 13.83, etc. Thes...

#### How many days in july and august

MonthsMonth NumberMonthDays in Month5May316June30

#### What is half of 1 cup

Half of 1 cup is equivalent to ½ cup. Half of 1 tbsp is equivalent to 1 ½ tsp....

#### Which is bigger cm or meters

A centimeter is 100 times smaller than one meter (so 1 meter = 100 centimeters). A dekaliter is 10 times larger than one l...

#### How to find circumference using radius

To calculate the circumference, you need the radius of the circle: Multiply the radius by 2 to get the diameter. Multiply ...

#### What is considered an integer

A integer is any number that is not either a decimal or a fraction (however, both 2.000 and 2/2 are integers because they can be simplif...

#### How to find missing endpoint

The fastest way to find the missing endpoint is to determine the distance from the known endpoint to the midpoint and then...

#### On average how many weeks are in a month

How many weeks in a month. The average number of weeks in a month is 4.345. Each month has at least 4 full <...

#### How many 16 oz bottles in a gallon

A gallon of water by definition is 128 fluid ounces in the United States. Water bottles can vary in size, but the total number of bottles makin...

#### What does e mean in algebra

The number e , sometimes called the natural number, or Euler's number, is an important mathematical constant approximately equal to 2.71828. Wh...

#### A half gallon is how many ounces

For example, to find out how many fluid ounces there are in a half gallon, multiply 128 by 0.5, that makes 64 fluid ounces in a half gallon. Co...

#### What time is 6pm in military time

6:00 p.m. - 1800 hrs. 7:00 p.m. - 1900 hrs....

#### How to find the place value of a number

Decimal Place Value In a decimal number, the digits to the left of the decimal point represent a whole number. The digits to the ...

#### How to change repeating decimals to fractions

Convert a Repeating Decimal to a FractionCreate an equation such that x equals the decimal number....

#### What does a negative standard deviation mean

Square of a number cannot be negative. Hence Standard deviation cannot be negative. As soon as you have at least two numbers in ...

#### How to figure square feet in a circle

The formula for determining the total square feet in a circular area is: A = Pi x R2 (Area = Pi x R-squared). This formula...

#### How to prove that two lines are parallel

If two lines are cut by a transversal and the alternate exterior angles are equal, then the two lines are parallel. Angles can be equal ...

#### What direction is counterclockwise

counter clockwise the is rotation or movement of an object which is in the opposite direction of any clock. When we see from the top, the circu...

#### When does celsius equal fahrenheit

Key Takeaways: When Does Fahrenheit Equal Celsius? Celsius and Fahrenheit are two temperature scales. The Fahrenheit and Celsius scales have one point...

#### How to find the vertex in intercept form

How do you find the vertex of the graph of a quadratic function written in intercept form? Intercept form is also known as factor...

#### How to complete long division

Show students the new steps:Divide the ones column dividend by the divisor.Multiply the divisor by the quotient in the ...

#### How to random sample

How to perform simple random samplingStep 1: Define the population. Start by deciding on the population that you want to study. ...

#### What is tan on the unit circle

Instead, think that the tangent of an angle in the unit circle is the slope. If you pick a point on the circle then the slope will be it...

#### How to find intercept of regression line

The intercept of the regression line is just the predicted value for y, when x is 0. Any line has an equation, in terms of its sl...

#### How many edges does a polyhedron have

Every polyhedron has three parts: Face: the flat surfaces that make up a polyhedron are called its faces. These faces are regular polygo...

#### How many feet in a second

One degree of latitude equals approximately 364,000 feet (69 miles), one minute equals 6,068 feet (1.15 miles), and one-second eq...

#### What is constant speed

Definition: When the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed....

#### What is the inverse of 1/x

Inverse function of y=1x is y=1x itself....

#### What is the difference between slope and rate of change

Slope is the ratio of the vertical and horizontal changes between two points on a surface or a line. If coordinates of any two points o...

#### What does the word median mean in math

The median is the middle number in a sorted, ascending or descending, list of numbers and can be more descriptive of that data set than ...

#### How to find the average of 4 test scores

An average test score is the sum of all the scores on an assessment divided by the number of test-takers. For example, if ...

#### How long is a roll of quarters

Quarter Rolls – 40 quarters, \$10 Face Value....

#### What is the factor of 1

The number 1 is the smallest factor of every number. Every number will have a minimum of two factors, 1 and the number itself. A number that has only ...

#### What is the speed of light in seconds

Light travels at a constant, finite speed of 186,000 mi/sec. A traveler, moving at the speed of light, would circum-navigate the equator approximately...

#### Why does cross product give perpendicular vector

Imagine a plane containing two vectors a and b and the angle from a to b equals θ, the cross product of a and b equals ||a|| ||b|| sin(...

#### How to find probability in normal distribution

Follow these steps:Draw a picture of the normal distribution.Translate the problem into one of the following: p(X < a),...

#### How do i find force

The force (F) required to move an object of mass (m) with an acceleration (a) is given by the formula F = m x a. So, force = mass multip...

#### What is the square of 25

Table of Squares and Square RootsNUMBERSQUARESQUARE ROOT224844.69023529

#### What does supplementary

1 : added or serving as a supplement : additional supplementary reading. 2 : being or relating to a supplement or a supplement...

#### What do the interior angles of a quadrilateral add up to

Since the sum of the interior angles of any triangle is 180° and there are two triangles in a quadrilateral, the sum of t...

#### What is the difference between grams and kilograms

A gram (g) is used to measure the weight or mass of very light objects. A small paperclip weighs about a gram. A kilogram ...

#### Why does the evaporation of water cool the air

Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid...

#### How much do you win if you get just the powerball number

Unfortunately, you don't win much if you only match one Powerball number, and whether you win anything at all depends on which color you match. If you...

#### What is the hcf of 12 and 18

Factors of 12 = 1, 2, 3, 4, 6 and 12. Factors of 18 = 1, 2, 3, 6, 9 and 18. Therefore, common factor of 12 and 18 =...

#### 15 equals what fraction

How to Write 0.15 or 15% as a Fraction?DecimalFractionPercentage0.255/2025%<...

#### What goes on x and y axis

The Axes. The independent variable belongs on the x-axis (horizontal line) of the graph and the dependent variable belongs on the...

#### What grade is 18 out of 20

Convert fraction (ratio) 18 / 20 Answer: 90%...

#### What is 0.2 as a fraction

Answer: 0.2 when converted into fraction is 1/5....

#### Why do atoms bond

Atoms form chemical bonds with other atoms when there's an electrostatic attraction between them. This attraction results from th...

#### For what numbers is tan not defined

F(theta) = Tan Theta Is Not Defined For Numbers That Are Of Pi/2 (90 Degree)....

#### How to calculate chord length of an arc

where s is the arc length, R is the radius of the circle, x is the central angle in radians, α is the central angle in degrees. A circular seg...

#### What is a 99

A 99 Flake ice cream, or more commonly a 99 or ninety-nine, is an ice cream cone, usually made with soft serve ice cream, into which a F...

#### How to plot points on a coordinate plane

Rules to plot a point in the coordinate plane given its ordered pairWe move along the x axis that many units from ...

#### Use the discriminant to find what type of solutions the equation has

Use the discriminant to determine if a quadratic equation has two real solutions, one real solution, or two complex ...

#### What is 72 divisible by

The numbers for which 72 is divisible are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72, and 72. You may also be interested ...

#### How to find vertices of an ellipse

How To: Given the vertices and foci of an ellipse centered at the origin, write its equation in standard form.Determin...

#### Why does supply curve slope upward

In most cases, the supply curve is drawn as a slope rising upward from left to right, since product price and quantity supplied a...

#### How much does a nickel bag weigh

Nickel Bag This is the absolute smallest amount that anyone would sell you. Most often it's going to be low-grade because \$5 worth of high-grade would...

#### What is a standard unit of measurement

Standard units are commonly used units of measurement, which help us measure length, height, weight, temperature, mass and more. ...

#### Why does a muscle cell contain many mitochondria

Respiration takes place in the mitochondria of cells in order to provide the cell with energy. As muscle cells have a high...

#### When to use pert formula

The main reason a project manager will want to use the PERT Formula is to have an estimate for cost or duration that is accurate. When p...

#### What are linear angles

Linear pair of angles are formed when two lines intersect each other at a single point. The angles are said to be linear i...

#### How to find relative deviation

The relative standard deviation (RSD) is often times more convenient. It is expressed in percent and is obtained by multiplying the stan...

#### How to find the outlier of a set of numbers

How to Find Outliers Using the Interquartile Range(IQR)Step 1: Find the IQR, Q1(25th percentile) and Q3(75th ...

#### What is the surface area of a cube

The surface area of a cube = 6a2 where a is the length of the side of each edge of the cube. Put another way, since all sides of a cu...

#### How long does it take to walk .4 miles

Typically, adults walk at a speed of 3 to 4 miles per hour, and therefore walk a mile in around 15 to 20 minutes. Some people will be faster or...

#### What is 8 bit binary

Bit & Byte Computer uses the binary system. There are two possible states in a bit, usually expressed as 0 and 1. A series of

#### How to make 4 quadrants in word

To split a page to 4 parts, you can insert a table to deal with the job.Place the cursor at left-top of the page, then click Ins...

#### Which shape is not a parallelogram

An ordinary quadrilateral with no equal sides is not a parallelogram. A kite has no parallel lines at all. A trapezium and...

#### How many covalent bonds does sulfur have

Sulfur is a nonmetal in group 6A , and therefore has 6 valence electrons. In order to obey the octet rule, it needs to gain 2 electrons . It can do th...

#### 2 is what percent of 4

FractionPercent1/425%2/450%3/475%...

#### What is a dilation in math terms

Dilation means changing the size of an object without changing its shape. The size of the object may be increased or decreased based on the sca...

#### How to find average volume

Divide the total from step two by the number of measurements you used. In this example, you would divide 130 by 4 to get an average volume of 3...

#### How to sum series

A series can be represented in a compact form, called summation or sigma notation. The Greek capital letter, ∑ , is used to represent the sum. The s...