An error is made in solving the equation below. what is the correct solution to the equation?
50 points plz !

5(x – 5) = 15

5(x – 5 + 5) = 15 + 5

5x = 20

5x ÷ 5 = 20 ÷ 5

x = 4

–50

–2

8

80

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

The function models the number of accidents

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a