15% of what number equals 12?

If you place a 40-foot ladder against the top of a 24-foot building, how many feet will the bottom of the ladder be from the bottom of the building?

If a and b are real numbers with a-b=1, what is the least possible value of a^5-b^5? Express your answer as a common fraction

The cylinders are similar. The volume of the larger cylinder is 40,635 cubic centimeters. What is the volume of the smaller cylinder? 1145 cm3 2578 cm3 2123 cm3 1505 cm3

ann has 5 brand new CD's, which is 3 less than twice the that bob (x) has. translate the situation into an algebraic equation

Solve - 6x+3-12x-8=31

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.