Tim has $65 to spend at the sporting goods store. He buys 3 balls for $6 each. How many $8 sports towels can Tim buy? *

5

Step-by-step explanation:

balls + sports towels = Total

              (3 * 6) + (8x) = 65

                      18 + 8x = 65

                             8x = 47

                              x = 5.875

Cannot buy .875 of a towel so answer has to be rounded down to 5 towels.

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