X+3/ x2-9x+20
a.4
b-3
c-4
d 5
e.3
f -5
apex

Step-by-step explanation:

The first derivative simplifies to ...

  d/dx( ) = -(x^2 +6x -47)/(x^2 -9x +20)^2

This has zeros that can be found by the usual methods of solving quadratics:

  x = -3 ±2√14

The positive value of x corresponds to what I might call an "apex." (See the first attachment.) The negative value is where the function turns around an approaches the horizontal asymptote from below. (See the second attachment.)

the answer is 510

step-by-step explanation:

15 • 13 = 195

15 • 12 = 180

15 • 5 = 75

12 • 5 = 60

195 + 180 = 375

375 + 75 = 450

450 + 60 = 510

175

step-by-step explanation:

2 inches x 10 miles = 200 miles - 3 inches = 175