Marco is selling floral arrangements. each arrangement uses 1 vase and 11 orchids. each vase costs marco $4.00.let c be the total cost of the arrangements and r be the cost of 1 orchid .which equation should marco use to find the total cost of each arrangements? answer the question correctly i'm giving 15 points

The total cost of each arrangement is c = $4.00 + (11*r)

Step-by-step explanation:

each arrangement has 1 vase and 11 orchids.

1 vase = $4.00

c = the total cost of the arrangements

r = the cost of 1 orchid

The formula to determine the total cost of each arrangements, as below

the total cost of each arrangement = 1 vase + ( 11 * the cost of 1 orchid)

                                                    c = $4.00 + (11*r)

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