How is 1.2 x 1.3 = 1.56

Which of the following statements is always true for all values of a A) - a = a B) |a| = - a C) |a| = a D) - (-a) = a

A university newspaper is conducting a survey to determine what fraction of students support a $200 per year increase in fees to pay for a new football stadium. How big of a sample is required to ensure the margin of error is smaller than 0.

There are 100 senators in the 115th Congress. Democrats make up $/frac{46}{100}$ of the senators, and Republicans make up $/frac{13}{25}$ of the senators. The rest are Independents. What fraction of the senators are Democrat or Republican?

Why shouldn't all ratios be simplified

Whats an explicit rule for this? 1, - 4, - 9, - 14, etc. Write an explicit formula for the nth term an.

How do i work out perimeter?

Anton is training for a cross-country race. He ran 2 2/4 miles on Saturday and 3 1/4 miles on Sunday. How much farther did Anton run on Sunday? How do you know?

If the squareof a positive number is increased by 3 times the number the result is 54 find the number

Volume is the amount of space an object takes up. False True

How many? one-to-one correspondences are there between two sets with 7 elements? each?