3c(5+c) -2c (3c-7) plz solve it

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?