Marta is solving the equation S = 2πrh + 2πr2 for h. Which should be the result?

 h = (S - 2πr²) / 2πr

Step-by-step explanation:

Since we are given that

S = 2πrh + 2πr²

Subtracting by 2πr² on both sides we get

S - 2πr² = 2πrh

Dividing by 2πr on both sides we get

(S - 2πr²) / 2πr = h

So

The final equation is

h = (S - 2πr²) / 2πr

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18