Chad bought a watch that normally costs dollars. He used a 30\% discount. The expression 0.7w describes the amount of money Chad paid for the watch. We can also use the expression w - 0.3w to represent the same quantity Match each amount in the situation with the expression that represents it.

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right

i think it is 18

step-by-step explanation:

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