PLEASE HELP MATH FINAL PLEASE I REALLY NEED HELP

I WILL MARK BRAINLIST

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).