Answer:
9 hours
Step-by-step explanation:
Abe's charge = Gabe's charge
$130+($70/hr)h = $40+($80/hr)h
Then 130 + 70h = 40 + 80h, or
90 = 10h, or h = 90/10 = 9
When 9 hours have passed, the amount charged by each person will be temporarily equal.
Answer:
2/3 = 16/24
5/8 = 15/24
Step-by-step explanation:
2/3= 16/24
5/8= 15/24
because if you multiply across 
by 
equal 
and if you multiply across 
by 
equal 
Answer:
x = - 2, x = 7
Step-by-step explanation:
Given
f(x) = 4x² - 20x - 56
To find the zeros let f(x) = 0, that is
4x² - 20x - 56 = 0 ( divide through by 4 )
x² - 5x - 14 = 0 ← in standard form
(x - 7)(x + 2) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 2 = 0 ⇒ x = - 2
x - 7 = 0 ⇒ x = 7
39 times 3 and 15 times 3 then 27 times 2 then add together to get 216
