This is for middle school 8th grade new question need help last one :)

y = (9/2)x + 12

Step-by-step explanation:

The y-intercept is 12 because when the number of games on the x-axis is 0 the cost on the y-axis was 12. The slope is 9 over 2 because the slope is rise over run and if you count up from one point to the next whole number point you get 9 and if you count over from there horizontally you get 2.

bru

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81