Martin bought 12 bottles of pop. When he got to the till, he used a $2 coupon as part payment. His final bill was $7.
a. Set this problem up as an equation using p as the cost of one bottle of pop.

2x - 12 = 7

Step-by-step explanation:

it says he bought it and it has the final price as seven

so this how it will be solve

sorry if i am wrong =/

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

pi x^2

step-by-step explanation:

pi times x squared