How many miles are in 8,216 feet

There are 5,280 feet in a mile. So There's at least one mile in 8,216 feet.

-138 ≥ -6(6b - 7)

Start by multiplying everything within the parentheses by -6.

-138 ≥ -36b + 42

Now move the +42 to the other side, so you're left with -36b. (You do this by subtracting 4242)

-138 - 42 ≥ -36b

-180 ≥ -36b

Divide both sides by -36 to find the value of b.

-180 / -36 ≥ b

5 ≥ b.

The answer is b ≤ 5.