The food truck is selling sandwiches. it costs $7 each week to advertise the sandwiches. each sandwich costs $4.25 to make and each sells for $6.50. write an equation to model the amount of profit, p, the food truck will make from selling x sandwiches in one week. a. p = 4.25x − 7 b. p = 2.25x − 7 c. p = 6.50x − 4.25 d. p = 7x + 2.25

step-by-step explanation:

i believe its "c" because all of the other options include a but it could be d because there is a way of financing with cash at certain places but its uncommon.

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