I need help with my homework for similar right triangles and geometric mean.

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

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?

Jessie and bob are financing $425,500 to purchase a house. they obtained a 30/8 balloon mortgage at 6.55%. what will their balloon payment be?