10r-5r+3r-8r how do I do this?

Which expressions are equivalent to 16^x/4^x

Which lines are parallel in the regular pentagonal prism?

9000000 in standard form

After Albemarle's heat wave, the rest of June was cooler. In fact, at the end of the month, meteorologists reported that the average high for all 30 days in June was just $80^/circ$ (degrees Fahrenheit).

Of three positive integers, the second is twice the first, and the third is twice the second. One of these integers is 17 more than another. What is the sum of the three integers?

Raffle tickets are sold and 6 prizes are available for the lucky draw. A total of 1,356 raffle tickets are sold for 4/5 dollars each and the 6 prizes cost 8 3/10 each. How much money was raise from the raffle tickets?

What are the side lengths of the rectangle area is 40 perimeter is 28

Fifteen decreased by the quotient of a number and 3 is 20

one pump can drain a pool in 12 minutes. when a second pump is also used, the pool only takes 5 minutes to drain. how long would it take the second pump to drain the pool if it were the only pump in use?

Gustavo is in a contest where he will win one of four possible