How can you change a percent to a fraction? how can you change a percent to a decimal? how can you change a decimal to a fraction?

To change a percent to a fraction, you just have to know that 1% = 1/100

Example: 75% = 75/100

To change a percent to a decimal, you just have to know that 1% = 0.01

Example: 75% = 0.75

To change a decimal to a fraction, you just have to know that 0.01 = 1/100

Example: 0.75 = 75/100

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