Diana is painting statues. she has \dfrac{7}{8} 8 7 ? start fraction, 7, divided by, 8, end fraction of a liter of paint remaining. each statue requires \dfrac{1}{20} 20 1 ? start fraction, 1, divided by, 20, end fraction of a liter of paint. how many statues can she paint?

21

step-by-step explanation:

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

18.75 gallons

step-by-step explanation: