4. If the position of a vehicle is given by the equation: x(t)= 2t2 - 20t, find: A. the average rate of change (velocity) between. t= 1 and t = 3.

Below

Step-by-step explanation:

● x(t) = 2t^2 -20t

A is the average change between t = 1 and t = 3 wich also the velocity.

● A = [x(3)-x(1) ]/(3-1)

● A = [ x(3) - x(1)] / 2

● x(3) = 2×3^2 - 20 ×3 = 18-60= -42

● x(1) = 2×1^2 -20×1 = 2-20 = -18

● A = (-42-(-18))/2

● A = (-42+18)/2

● A = -24 /2

● A = -12

A is negative so the car must be going backwards

7

step-by-step explanation:

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.