Tenley is making a square frame for her painting. she is using 4 pieces of wood that are each 2.75 ft long. how much wood will tenley use to make the frame?

11 feet.  

Step-by-step explanation:

We are told that Tenley is making a square frame for her painting. She is using 4 pieces of wood that are each 2.75 ft long.

To find the total amount of wood used in making the frame we will multiply amount of wood of each piece (2.75) by number of wood piece used to make the frame (4).  

Therefore, Tenley used 11 feet of wood to make the frame.

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