Can some one solve 4 for me plz I’ll give a crown

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?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?