Teresa eats in a resturaunt that charges 6% sales tax on the cost of a meal. teresa decides to leave a tip that equals 18% of the cost of her meal.
which expression represents the total amount teresa will pay for a meal, where x is the cost of her meal before the tax and tip?
a. x+x(0.06)+x(0.18)
b. x+(x+0.06)+(x+0.18)
c. x+(x-0.06)+(x-0.18)
d. x+x(1+0.06)+x(1+0.18)

don't know sorry bru

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