**Answer:**

h = 3V / π r^2.

**Step-by-step explanation:**

V = 1/3 π r^2 h

h = V / ( 1/3 π r^2)

= 3V / π r^2.

**Answer:**

2x+1

**Step-by-step explanation:**

(4-2x), (-7-3x),(11x+6)

Add the three expressions

(4-2x)+ (-7-3x)+(11x+6)

Combine like terms

-2x-3x+11x+4-7+6

6x+3

Divide by the number of expressions which was 3

(6x+3)/3

2x+1

The average is 2x+1

**Answer: the slope is 4 and the y intercept is 3. Hope this helps!**

7x + 2y = 19

-x + 2y = 21

7x + 2y = 19

Subtract 2y from both sides

7x = 19 - 2y

Divide both sides by 7

x = (-2/7)y - (19/7)

x + 2y = 21

Substitute x for (-2/7)y - (19/7)

(-2/7)y - (19/7) + 2y = 21

Combine like terms

(12/7)y - (19/7) = 21

Add (19/7) to both sides

(12/7)y = (166/7)

Multiply both sides by (12/7)

y = (83/6)

x + 2y = 21

Substitute y for (83/6)

x + 2(83/6) = 21

Multiply 2 by (83/6)

x + (83/3) = 21

Subtract (83/3) from both sides

x = (-20/3)

x = (-20/3)

y = (83/6)

5x+4 u add -8x and 13x and then -2 +6