Answer:
Step-by-step explanation:
for dot plot A, the mean is 90 to the medium becuase it has the most dots out of them all.
8 + 2(10 - r) = 8 + 20 - 2r = 28 - 2r
Simplify brackets
2/5(x - 4) = 2x
Simplify 2/5(x - 4) to 2(x - 4)/5
2(x - 4)/5 = 2x
Multiply both sides by 5
2(x - 4) = 10x
Divide both sides by 2
x - 4 = 5x
Subtract x from both sides
-4 = 5x - x
Simplify 5x - x to 4x
-4 = 4x
Divide both sides by 4
-1 = x
Switch sides
<u>x = -1</u>
