Leila received a $90 gift card for a coffee store. she used it in buying some coffee that cost $8.64 per pound. after buying the coffee, she had $64.08 left on her card. how many pounds of coffee did she buy?

c

step-by-step explanation:

i think because what else can be a sample of every member

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

answer: i literally just answered this question but they want me to do it again

step-by-step explanation: