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Algebra

The use of letters to substitute unknown numbers to form an equation. Solve the equation to get the unknown number using different methods such as simultaneous equations and more.

500 Questions

What is the mean of the first 100 digits of pi?

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3.14159265358979323864062384626238832795028841971693939937510582097494459230781640628620898628034825342117067

These are the hundred digits of pi

What is 3 gal 3 qt - 3qt 1 pt?

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2 gallons, 3 quarts, 1 pint.

Which types of numbers make you move left or down the coordinate plane?

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A negative x coordinate would make you move left, and a negative y coordinate would make you move down.

12.3 miles in 42 minutes is how many miles per hour?

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To convert the time from minutes to hours, divide by 60, since there are 60 minutes in an hour.

42 minutes ÷ 60 = 0.7 hours

To find the speed in miles per hour, divide the distance by the time.

3 miles ÷ 0.7 hours = 4.29 miles per hour

Therefore, 3 miles in 42 minutes is approximately 4.29 miles per hour.

Complex conjugate of 5i?

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0 + 5i

Its complex conjugate is 0 - 5i

What is another name for a parallelogram with the same length and the same angles?

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A SQUARE

A rectangle satisfies the angles but not the lengths.

A rhombus satisfies the length, but not the angles.

A parallelogram neither satisfies length nor angles.

Tanisha has 70 coins all quarters and dimes there are 30 more quarters than dimes find the number of each type of coin?

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To answer a question like this,you need to think a little bit. The question is really "What combination of numbers of coins will add up to 70, and has a difference of 30 between the two numbers?" For example, lets say old Tanisha had 10 dimes and 60 quarters - 10 plus 60 indeed adds up to 70, for the number of coins we're looking for, but the difference between 10 and 60 is 50, not quite the 30 we are looking for. But we're on the right track. How about 20 and 50? Hmm... adds up to 70... and has a difference of 30. So ol' Tanisha has 50 quarters and 20 dimes. Not a bad stash.

What is 31 over 8 as a mixed number?

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31/8 is an Improper Fraction.

To convert to a mixed number.

Divide by '8'

Hence 8)31 = 3 remainder '7'

The '3' is the coefficient (LARGE) number and the '7' becomes the fraction 7/8

Hence

31/8 = 3 7/8

What is x squared plus 4x minus 12?

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x^2 + 4x - 12

Is a Quadratic Equation.

It will factor to

( x + 6)(x - 2)

How do you write 7x7x7x7x7x7 as a power of 7?

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You would write 7x7x7x7x7x7 as 7^6 (the ^ means to the power of, 7^6 is the same as 76. You would do this because there are 6 sevens there, and 7^6 means 7 times t times 7 times 7 times 7 times 7.

How many numbers go into 121?

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3 numbers are factors of 121. They are 1, 11 and 121 itself.

What is 7 over 9 divided by 8 over 15?

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In order to solve 7/9 divided by 8/15, you must multiply by the reciprocal. In other words, 7/9 divided by 8/15 becomes 7/9 multiplied by 15/8. After this, you can cross cancel if there are common factors. 9 and 15 have a common factor of 3, so you can divide each by 3. The problem then becomes 7/3 multiplied by 5/8. You then multiply across the top and the bottom. Your final answer then is 35/24.

Which property states that the order of addends does not affect the sum?

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In the expression 3(4+5)which property allows you to distribute the 3to both the 4and 5

Write in standard form 378.72?

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Write in standard form 378.72

What are the x-intercepts of y 2x2 - 3x - 20?

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how do you factor y=2x^2+3x-20 to get the roots

What is the answer to page 7.17 in punchline algebra book A?

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The answer is "spare parts for a porcupine" with no spaces.

What is 7x42?

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249

What is half percent of 12?

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0.5% of 12
= 0.5% * 12
= 0.005 * 12
= 0.06