Ok i thought i could help but the most i could do with the 12x and 28y was do then by them self to get 84 i will keep trying though ok?
a = hours worked by the first mechanic
b = hours worked by the second mechanic.
since the first mechanic charges $55 per hour, then for "a" hours that'd be a total of 55*a or 55a, likewise, for the second mechanic that'd be a total charge of 80*b or 80b.
we know all hours combined are 15, so then a + b = 15.
we also know that all charges combined are $950, so 55a + 80b = 950.

Answer:
Step-by-step explanation:
(x/12) = (15/9)
x = 12 (15/9)
x = 20
The right answer is that The graph of the quadratic function has a vertex at (0,5). It was my pleasure to help!!
Answer:
B
Step-by-step explanation: