A^-4+b^2 when a=2 and b=3/4 answer as a reduced fraction

Describe how making an ‘and’ compound sentence effects your solution set

Robert is replacing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other is 5.7 feet. the sod costs y dollars per square foot.

Find x to the nearest tenth. a) 9.3b) 9.4c) 9.5