Pleaseee help

What is the perimeter of the rectangle? Write it in scientific notation

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

Find the dimensions of the circle. area = 64π in.² r= in.

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same