The algebraic expression dminus−20 is not equivalent to 20minus−d because

Because given expression are not same.

Step-by-step explanation:

We are given that an  expression

d minus 20

We are given that the given algebraic expression is not equivalent to 20 minus d why.

d minus 20=

20 minus d=

Hence,20 minus d is negative times of d minus 20.

Therefore, the given expression are not equivalent because given expression are not same.

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

28

step-by-step explanation:

8+8+6+6