1. Solve the equation. 2x - 5 - 4 = -x, x 5/2 Show all work, and verify the solution(s).

2.Police can estimate the speed a car had been travelling using the length of the skid marks. One formula used for this purpose is

v = -7 + 8.2 d, d 0, where v is the speed, in kilometres per hour, and d is the length of the skid marks, in metres.

• Solve the formula for d.
• For a car braking from a speed of 90 km/h, determine the length of the kids marks, to the nearest metre.
• What would have been the speed of a car, to the nearest kilometre per hour, that would have resulted in 150 m skid marks?