Police use the formula:
v = √ 20 l
to estimate the speed of a car, v , in miles per hour, based on the length, l , in feet, of its skid marks when suddenly braking on a dry, asphalt road. at the scene of an accident, a police officer measures a car's skid marks to be 194 feet long. approximately how fast was the car traveling? round your answer to the nearest tenth (one decimal place) of a unit.

62.3 miles per hours.

Step-by-step explanation:

The given formula is

Police use this formula to estimate the speed of a car, v , in miles per hour, based on the length, L , in feet, of its skid marks when suddenly braking on a dry, asphalt road.

It is given that car's skid marks is 194 feet at the scene of an accident.

We need to find the speed of car at the time of accident.

Substitute L=194 in the above formula.

Therefore, the speed of car is 62.3 miles per hours.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

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