Rachel is a stunt driver, and she's escaping from a building that is about to explode!
DDD represents Rachel's remaining distance (in meters) after ttt seconds.
D=-38t+220D=−38t+220D, equals, minus, 38, t, plus, 220
How long is the distance Rachel has to drive

Rachel has to drive for 5.789 seconds

Step-by-step explanation:

The equation that represents Rachel's remaining distance is:

When Rachel completely escaped from the explosion, she has no distance to cover.

Hence D=0.

Divide both sides by -38 to get:

Rachel will cover 220m in approximately 6 seconds.

The total distance she has to drive is 220m

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

i believe the answer is the polygon, heptagon.