The sum of two number is 25 and their difference is 7. find the numbers with work

Erin wants to purchase 3 CDs for $10 each. How much money does she need?

Which trigonometric function is equivalent to f (x) = sinx? f (x) = cos (x-3pi/2) f (x) = cos (x-pi/2) f (x) = cos (-x-pi/2) < - - i think this one, not sure f (x) = cos (x+pi)

There are 12 girls and 16 boys in diving class. One student is randomly selected to dive first. what is the probability that the student selected to dive first is a girl?

Is 6 - 1/2 = 4 1/2? if not can you explain?

Given the following mAB = mBC = mCD in circle F what is the measure of angle AFB

Debra drove 380 miles using 14 gallons of gas. At this rate, how many gallons of gas would she need to drive 418 miles?

State whether - -4-) and (-4) represent the same quantity, Explain,

A spherical solid of volume 123,456 is melted and recast into a solid cube. What is the side length of the cube?

The price of an article on sale was 70% of the regular price. If the sale price was $28, what was the regular price?

There are 12 players on a new softball team. before the team starts playing games the team must pay a total of $ 572. along with the registration fee, the team will also need to spend a total of $ 1,240 on equipment.