7points!

i'm learning about equations with square roots & cube roots in 8th grade math. (image included)

my main question is what is this ± symbol?

It is the plus minus sign. It means to do the addition and subtraction.

Examples:

10 ± 7 = 17 and 3

15 ± 5 = 20 and 10

100 ± 90 = 190 and 10

It is generally used to indicate a possibility of two outcomes. A negative or positive outcome.

This a very hard question about this place and this company does the right thing and the company always makes you think you can do what black

The answer is, the streetlight is 18 inches tall.