WILL MARK BRAINLIEST!

Carol's 3 best friends scored 5, 2, and 7 on the spelling quiz. They got 3, 6, and 9 correct on the science quiz. Which quiz has a greater variability of success?

Science quiz

Step-by-step explanation:

The Science Quiz had a greater variability because 3 to 9 (6) is a greater difference than 2 to 7 (5)

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