Calculus

A cubic meter is 1,000,000 cubic centimeters.

Since "regular centimeters" are used to measure length and cubic meters are used to measure volume, they cannot be compared, since they are used for two different purposes. (Like saying "How many gallons away is the moon?").

55% 20%

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They are not equal.

There are 10 millimetres in one centimetre. Therefore, 9 centimetres is equal to 9 x 10 = 90 millimetres.

pi (r^2)

Placing a question mark at the end of a list of expressions or numbers does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.

There is no common prime factor between the denominator and numerator, in other words, when their GCF is 1.

Acute.

128 quarts

2(2x^3 - 140x + 147)

go to http://webmath.com/. it helps a lot.

It is: 3y-6

One possibility: 9 + 99/99 = 10

h+1.5=8.4

subtract 1.5 from both sides

h=6.9

The derivative of y=arcsin(4x) is dy/dx = 4/sqrt(1-16x2).

It means that you multiply some quantity by 2.

Step 1: 4n=12

Step 2: divide both sides by 4

Step 3: 4n/4 = 12/4

Step 4: reduce

Step 5: n=12/4

Step 6: n=3

how to figure things out using known rules

2

x + 1/3 = 144
solve for x
x = 144-1/3
change the fraction to a decimal
x = 144-0.333
x= 143.667

0.7 x 8 = 5.6

4

-7t = 42

Multiply each side by -1:

7t = -42

Divide each side by 7:

t = -6