! PLEASE HELP QUICKLY ! A linear function is given by formula y= 1/2x - 2

What is the x-intercept of the graph?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

What is x3+3x2−16x−48 divided by x−1?

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