helppp please

Question

police can estimate the speed a car had been travelling by the length of the skid marks. one formula used for this purpose is V= -7+8.2√d

whare V is the speed. in kilometer per hour, and d is the length of the skid marks in metres, what is the speed of the car? to the nearest kilometer per hour if the length of skid mark is 150m.

Answer 1

The Speed of the car is v = -7 + 8.2√d where d is the length of the skid marks.

The Length of the skid marks = 150 m

v = -7 + 8.2√d

v = -7 + 8.2√150 = -7 + 8.2 * 12.24 = -7 + 100.4290

v = 93.4290

Round off to the nearest value v = 93

Speed of the car is 93 kmph.