8*40 = 320 * 2 = $640 for the 2 workers
640/2000 = 0.32
labor cost is 32% of the revenue
Since it's isosceles, ∠ABC = (180-30) / 2 = 75
Answer:
-4
Step-by-step explanation:
t2 - t1
-13 - (-9)
-13 + 9
= -4
The 6 terms of the series are
... 15, 14, 13, 12, 11, 10
The sum of them is 75.
_____
You could make use of the formula for the sum of the terms, or you could work out the sum from the given expression. It is easier just to list the terms and and them up.
