A factory is manufacturing cell phones that must each have a thickness of 0.5±0.001 inch. Which inequality describes the acceptable range of x, the thickness in inches of a cell phone?

A factory is manufactuaring cell phones that must each have a thickness of 0.5+/-0.001 inch. Which inequality describes the acceptable range of x, the thickness in inches of a cell phone?

A. 0.499 ≤ x ≤ 0.501

B. x ≤ 0.49 or x ≥ 0.51

C. x ≤ 0.499 or x ≥ 0.501

D. 0.49 ≤ x ≤ 0.51

I believe it was C

step-by-step explanation:

always plug in x. in this case, x equals 4.

i'm going to first solve 4(2+3x)

1) 4(2+3(4)) use pemdas to solve.

i'm going to multiply whats in the parenthesis first, so 3 times 4=12.

2)4 (2+12) i'm then going to multiply 4 by both numbers in the parenthesis (because multiplying comes before adding)

4 times 2= 8.   4 times 12= 48

4) (8+48)= 56 (answer)

i'm then going to solve 8+12x and plug in 4 for x.

1) 8 +12(4)

multiplying comes before adding, so i'm gonna multiply 12 and 4.

12 times 4= 48.

2) 8+48=56

both equal the same!

one set of data has more variation than the other. hope this !