Answer:
Instantaneous rate of change = -13
Equation of tangent line : y= -2x +6
Step-by-step explanation:
the instantaneous rate of change of the function
at the point (-1,7)
To find instantaneous rate of change we take derivative


Now we plug in -1 for x

Instantaneous rate of change = -13
the equation of the line tangent to the function f(x) at the point (1,4)

To find slope of tangent line take derivative

Plug in 1 for x . given point is (1,4)

so slope = -2
use equation 


Add 4 on both sides
y= -2x +6