Depth of Hank descends = The point he reached - the point where he worked initially
= 57 - 10
= 47 ft
Hence, Hank descends 47 ft.
Answer:
-a^2 - a + 12
Step-by-step explanation:
You only need to find the products of the first and last terms to determine the correct answer:
(-a)(a) = -a^2
(3)(4) = 12
You're looking for an expression with -1 as the leading coefficient and +12 as the constant. There is only one choice like that:
-a^2 - a + 12
Let e be the minimum number of workers needed.
e(100-3)/100≥215
97e/100≥215
97e≥21500
e≥21500/97
e≥221.6
Since the number of employees must be an integer...
e≥222
So the minimum number of employees needed is 222.