Please help, Equations and graphs!! Please help- I can't fail

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Larger pets need to be transported in larger portable kennels. using a graphing calculator and the relationship between the width, length, and height, find the dimensions of a portable kennel whose volume is 7.4 ft3. the dimensions of a portable kennel can be expressed as width x, length x + 0.4, and height x − 0.2? what are the dimensions of a portable kennel with a volume of 7.4 ft3? use a graphing calculator to solve. round the dimensions to the nearest tenth.