Which of the following is not true of exercise machines? a. most exercise machines are expensive to purchase individually. b. most exercise machines require spotters for safe operation. c. most exercise machines require less skill to use than free weights. d. most exercise machines can only be used for a limited number of exercises.

Hihi!

The correct answer would be C. Most exercise machines require less skill to use than free weights!

I hope I helped!

-Loliarual

option C is the answer " Most exercise machines require less skill to use than free weights."

a, b, c - sides of a triangle

a + b > c

a + c > b

b + c > a

we have a = 5m and b = 11m. substitute:

5 + 11 > c

16 > c → c < 16

5 + c > 11         subtract 5 from both sides

c > 6

11 + c > 5         subtract 11 from both sides

c > -6

c < 16 and c > 6 and c > -6

thereofre your answer is 6m < c < 16m

what effect does exercise have on the nervous system?

the answer is c.