Correct answer only ! i cannot retake

Your job looks correct. The number of small boxes is x, and we know that she has at least 4 of them so we have .

We have no information about the number of large boxes, so the first two options make no sense.

Also, x boxes weighing 5lb and y boxes weighing 12lb sum up to , and this weight can be at most 80, so we have

probability for j is 1/4

while

a is 1/6

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