An office building has 8 floors above the ground. on a line graph that models the average number of times the elevator stops on each floor each day, which values will be the x-coordinates?

D = {1, 2, 3, 4, 5, 6, 7, 8}

Step-by-step explanation:

The x-coordinates are the domain values for the function.

There is no 0 floor. The floors are not negative.

The correct answer is D = {1, 2, 3, 4, 5, 6, 7, 8}.

Answer choice on USA Test Prep is A

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15