Dave cuts a 12-foot-long streamer into 8 pieces of equal length. How long is each piece.

1 1/2 feet or 1.5 feet

Step-by-step explanation:

Dave cuts a 12-foot-long streamer into 8 pieces of equal length. How long is each piece

From the question:

8 pieces = 12 feet

1 piece = x feet

Cross Multiply

8 pieces × x feet = 1 piece × 12 feet

x feet = 1 piece × 12 feet/8 pieces

x feet = 3/2 feet

x feet = 1 1/2 feet or 1.5 feet

Therefore, the length of each feet =

1 1/2 feet or 1.5 feet

its c or d   take a lucky guess my dude

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