a hiker started at the bottom of a mountain which was 227 feet above sea level and climb 445 ft what is the difference between where he stopped and where he started

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?