Peggy has saves 9,215. if she is paid $45 an hour, how many hours did she work?

First we set up our equation.  We know she has $9,215, and she gets paid $45 an hour.  So our variable would be the hours she has to work.

45n=9,215

Since we don't have any like terms to combine, we just divide both sides by 45, to isolate the variable.

n=204.8  Hope this helped!

-TTL

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