logo semaths.comSEMATHS.ORG

Recent questions

How did february get its name

While January takes its name from Janus, the Roman god of beginnings and endings, February comes from the word februum (purification) an...

What does interpolate mean in math

Interpolation, in mathematics, the determination or estimation of the value of f(x), or a function of x, from certain known values of th...

What is ln0

The real natural logarithm function ln(x) is defined only for x>0. So the natural logarithm of zero is undefined. ln(0) is undefined....

What is an absolute value equation

Absolute value equations are equations where the variable is within an absolute value operator, like |x-5|=9. If the number is n...

What countries use imperial system

Only three countries – the U.S., Liberia and Myanmar – still (mostly or officially) stick to the imperial system, which uses ...

How to do function tables

Write a function to represent the data in the table.Look at the x values. Next look at the y values. ...

What is a linear sequence

A linear sequence is a list of numbers that increases or decreases by the same amount each time....

35 out of 50 is what percent

Percentage Calculator: 35 is what percent of 50? = 70....

How does the graph of y = 3x compare to the graph of y = 3–x?

The graphs are the same. The graphs are reflected across the x-axis. The graphs are reflected across the -axis....

How to find degrees of freedom in chi square

The degrees of freedom for the chi-square are calculated using the following formula: df = (r-1)(c-1) where r is the numbe...

How to write less than or equal to in word

Go to Insert tab, click Symbol button and choose More Symbols in the drop-down box. 2. The Symbol will display, select (normal te...

What does combine like terms mean in math

Like terms are terms that contain the same variables raised to the same power. We combine like terms to shorten and simplify alg...

How many lottery tickets would you have to buy to win

There are /b> possible combinations of the first five numbers ranging from 1 to 70. Multiply that by the 25 options for the final ball and you get ...

How to find angles of an isosceles triangle

Interior angles If you are given one interior angle of an isosceles triangle you can find the other two. For example, We are give...

How to calculate weight in excel

Calculating Weighted Average in Excel – SUM Function While SUMPRODUCT function is the best way to calculate the weighted averag...

How many handshakes formula

# handshakes = n*(n - 1)/2. This is because each of the n people can shake hands with n - 1 people (they would not shake their own hand)...

How to calculate a intersect b

The Product Rule applies to events which are independent. Only then is the probability of the intersection equal to the product of the probabil...

65 is what percent of 500

Percentage Calculator: 65 is what percent of 500? = 13....

How did wednesday get its name

Wednesday is "Wōden's day." Wōden, or Odin, was the ruler of the Norse gods' realm and associated with wisdom, magic, victory and death. The ...

How to calculate mean average deviation

To find the mean absolute deviation of the data, start by finding the mean of the data set. Find the sum of the data value...

How is a square a parallelogram

Parallelograms are quadrilaterals with two sets of parallel sides. Since squares must be quadrilaterals with two sets of parallel sides, then a...

What is the plus sign with a line under it

The plus–minus sign (also, plus or minus sign), ±, is a mathematical symbol with multiple meanings. In mathemati...

What is connect four

Connect-Four is a tic-tac-toe-like two-player game in which players alternately place pieces on a vertical board 7 columns across and 6 ...

What is the prime factorization of 900

Prime Factorization of 900 by Division Method Therefore the prime factorization of 900 is 900=2 × 2 × 3 × 3 × 5 × 5 Or 22 ×...

How to find total number of combinations

The formula for combinations is generally n! / (r! (n -- r)!), where n is the total number of possibilities to start and r is the num...

How to do pythagoras theorem

The Pythagorean theoremPythagorean theorem"If in a triangle the square on one of the sides equals the sum of the squares on the remaining...

What is 1000 billion

In the American system each of the denominations above 1,000 millions (the American billion) is 1,000 times the preceding one (on...

How many zeros in a billion trillion

NameShort scaleLong scalebillion1,/b> (a thousand millions)1,000 (a million millions...

Why is there a leap year every four years

Blame Earth's orbit around the sun, which takes approximately 365.25 days. It's that . 25 that creates the need for a leap year every four years

How many numbers less than 1000 are divisible by 3

We are left out with 1000 and we can make out that it is not divisible by 3. Hence, total numbers between 1 and 1000 divisible by 3 = 3 + 30 + ...

When traveling north what direction is to the right

Just as you memorize multiplication tables, it is important to memorize how the directions relate. -When I face north, south is behind me, w...

How to find mean with standard deviation and sample size

It is calculated by dividing the standard deviation by the square root of the sample size ( ), and so it gets smaller as the sample s...

What is a number factor

Factors are the numbers you multiply together. to get another number: There can be many factors of a number....

What is e in precalculus

"e" is a commonly used base for exponential functions. Any number greater than 0 (except for 1) can be used for an exponential function. "e<...

How does bc time work

B.C. stands for "before Christ," meaning before Jesus was born. So 400 B.C. means 400 years before Jesus was born. A.D. comes fro...

0 1 2 3 4 are what kind of numbers

My StandardNameNumbersExamplesWhole Numbers{ 0, 1, 2, 3, ...

How to plot points on a graphing calculator

TI-84: Setting Up a Scatter PlotGo to [2nd] "STAT PLOT". Make sure that only Plot1 is ON. Go to Y1 and [Clear] ...

How to find the range of a dot plot

By examining the line plot, we find the number with the maximum number of crosses or occurrences. This gives the mode of the data set. W...

How to know when a function is even or odd

You may be asked to "determine algebraically" whether a function is even or odd. To do this, you take the function and plu...

What waves make up the electromagnetic spectrum

The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g.,...

What percent of 33.5 is 21

Percentage Calculator: 21 is what percent of 33.5? = 79....

What is 2 quarts of water

There are 8 cups in two quarts....

What is a definition in geometry

Filters. The definition of geometry is a branch of math that focuses on the measurement and relationship of lines, angles, surfaces, sol...

How many ounces in 6 cups of water

Convert 6 Cups to Ouncescupsfl oz6.00486.0148.086.02...

What is sin2theta

The number sin(2θ) is the sine of twice the angle θ. It is almost never equal to 2sin(θ). But there is an important "double-angle" identity sin(2θ...

How to measure cube

Units of MeasureVolume = length x width x height.You only need to know one side to figure out the volume of a cube

What is the slope of the tangent line

A tangent line is a straight line that touches a function at only one point. The tangent line represents the instantaneous rate ...

How is molar mass used in some stoichiometric calculations

1 Answer. In stoichiometry, molar mass is used to convert between the mass of a substance and how many moles of a substanc...

What is x with a line over it

Symbols for the mean: (an upper case X with a line above it) or (lower case x with a line above it) denote "the mean of the X sco...

How many milliliters in a liter chart

Measure of Volumes10 milliliters (ml) =1 centiliter (cl)1 liter =1000 milliliters1 ...

What is the definition of term in math

A term is a single mathematical expression. It may be a single number (positive or negative), a single variable ( a letter ), several va...

How many 16 oz bottles make a gallon

Answer: The number of 16 oz bottles of water to equal a gallon is 8....

What is the first step to solve the equation

Solving Equations with a Variable on Both Sides. After simplifying, the first step in solving an equation with a variable on both...

What animal weighs 1000 pounds

The right whale, one of the largest whales on Earth, has testicles that weigh roughly 1,000 pounds EACH....

How to calculate average formula

How to Calculate Average. The average of a set of numbers is simply the sum of the numbers divided by the total number of values in the ...

How many angles in a polygon

Polygons - Polygon basics - In Depth. The word polygon is a combination of two Greek words: "poly" means many and "gon" me...

How many gifts in 12 days of christmas song

Dr. WilsonShe gets 1 partridge in a pear tree on each of the 12 days.1 x 1212She gets 10 lords a-leaping...

How to calculate npv and irr

The IRR Formula Broken down, each period's after-tax cash flow at time t is discounted by some rate, r. The sum of all these discounted cash fl...

What is measurement for kids

Measurement is the action of measuring time, weight, height, temperature, length, speed, and more. Standard units, such as seconds, hour...

What does 1 1000 mean

What are ratio expressions of strength? Ratios are a way to express the strength of a solution or liquid preparation. For example, a 1:1,000...

What a real number

more The type of number we normally use, such as 1, 15.82, −0.1, 3/4, etc. Positive or negative, large or small, whole numbers or dec...

Why do exponential functions grow faster than polynomials

The main reason why the exponential grows faster than a polynomial is because if f is exponential, then f(n+1) is at least a cons...

How many wheels on a tricycle

A tricycle, often abbreviated to trike, is a human-powered (or gravity-powered) three-wheeled vehicle....

How to calculate percent discrepancy

Percent Error Calculation StepsSubtract one value from another. Divide the error by the exact or ideal <...

What is half of a right angle

45° is the half of right angle...

What do negative exponents do

A positive exponent tells us how many times to multiply a base number, and a negative exponent tells us how many times to divide a base ...

How to find median of data

To find the median:Arrange the data points from smallest to largest.If the number of data points i...

What year is leap year again

The next leap day is February 29, 2024. 2020 was also a leap year, so the last leap day was February 29, 2020....

How to roundup to nearest 0.5 in excel

Round to nearest 0.5To round a number down to nearest 0.5, use the FLOOR function, for example =FLOOR(A2, 0.5

Why is the electromagnetic spectrum called a spectrum

The waves of energy are called electromagnetic (EM) because they have oscillating electric and magnetic fields. Scientists classify them...

What grade is a 13 out of 15

Convert fraction (ratio) 13 / 15 Answer: 67%...

How many permutations of 3 numbers

There are, you see, 3 x 2 x 1 = 6 possible ways of arranging the three digits. Therefore in that set of 720 possibilities, each unique c...

What is the prime factorization of 72?

Factors of 72 by Prime Factorization Step 7: The prime factors of 72 are written as 2 × 2 × 2 × 3 × 3,= 23×32 2 3 × 3 2 , where 2 and 3 are the ...

How to write a system of equations

Here are some steps to follow:Understand the problem. Understand all the words used in stating the problem. Understand what you are ask...

How to write an atomic symbol

The symbol for an atom indicates the element via its usual two-letter symbol, the mass number as a left superscript, the <...

What is the common multiple of 8 and 12

Answer: LCM of 8 and 12 is 24....

What is radius of circle

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern u...

Why are only valence electrons involved in bonding

The nucleus and the electrons in the inner shell remain unaffected when atoms come close together. The electrons in outermost shell of ...

How many ounces in a bottle of rum

Liquor Shots per BottleHow Many Shots Are in a Bottle?BottleMillilitersOuncesStandard Bott...

How do you know the speed of an electromagnetic wave in a vacuum

The speed of any periodic wave is the product of its wavelength and frequency. v = λf. The speed of any electromagnetic waves...

What spider has 6 legs

Originally Answered: Are there any kind of spiders with 6 legs? There is one kind: the gladiator spider. A spider that has become a veteran of the art...

How to do 2 column proofs

When writing your own two-column proof, keep these things in mind:Number each step.Start with the given informat...

How to calculate a combination

Remember, the formula to calculate combinations is nCr = n! / r! * (n - r)!, where n represents the number of items, and r represents the numbe...

How to calculate a factorial

A factorial is a function that multiplies a number by every number below it. For example 5!= 5*4*3*2*1=120.What is a Factorial?...

What should be changed to make the following sentence true

What should be changed to make the following sentence true? Spontaneous acquisition is the return of a previously extinguished conditioned resp...

How many isomers of dichloroethylene have a zero dipole moment?

The answer is that one isomer of dichloroethylene has a zero dipole moment....

How to find the critical numbers of a function

Find The Critical Numbers Of A Function : Example Question #4. . Explanation: To find the critical numbers, find the values

How heavy is a liter of water

One litre of water has a mass of almost exactly one kilogram when measured at its maximal density, which occurs at about 4 °C. It follows, the...

How to know if a parabola opens up or down

There is an easy way to tell whether the graph of a quadratic function opens upward or downward: if the leading coefficient is gr...

What are the first 100 numbers of pi

3. PI/4 = 1/1 - 1/3 + 1/5 - 1/7 + PI/2 = 2/1 * 2/3 * 4/3 * 4/5 * 6/5 * 6/7 *...

How to add or subtract radicals

To add or subtract radicals, the indices and what is inside the radical (called the radicand) must be exactly the same. If the indices a...

Which number represents the value of the base in every number system?

The number 10 represents the base value in every number system. Representing a number in base 5 somet...

What does (f+g)(x) mean

So what does this mean (f g)(x), the composition of the function f with g is defined as follows: (f g)(x) = ...

How to find the capacity of a cylinder

The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. Substitute 8 f...

What does legs mean in math

The legs (or catheti; singular: cathetus) are the sides in a right triangle that form its right angle (90°). The side opposite the righ...

What makes two figures similar

In more mathematical language, two figures are similar if their corresponding angles are congruent , and the ratios of the lengths of th...

Is means what in math

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other wo...

How to do long division with 3 digit divisor

Let's start and divide by 3 digit numbers!How many digits are there in the divisor? 3!We ta...

How to find the frequency of a sine wave

The equation of a basic sine function is f(x)=sinx. In this case b, the frequency, is equal to 1 which means one cycle occurs in ...