To find the sales tax on an item, ​divide​ the price of the item by 20. a. Write an algebraic expression to find the sales tax on an item that costs ​d ​dollars.

b. Use your expression to find the sales tax on a television that costs $800.

1) d/20,

2) 40

Step-by-step explanation:

the first question just wants you to divide d/20. If a television costs $800, divide it by 20, and get 40

cant open file sorry!

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