Answer:
16 hours
Step-by-step explanation:
Let the mechanic works for x hours to make a money of $350.
Fixed charges = $30
Charges per hour = $20
So, charges for x hours = $20x
Total money earned = $350
Thus, the mechanic needs to work for 16 hours to make $350.
9514 1404 393
Answer:
18
Step-by-step explanation:
Put the value where the variable is and do the arithmetic.
3(4 +2) = 3(6) = 18
The value of the expression is 18.
10. A 11. D 12. A (wasn’t too sure about question 12)
-5T^2 + 45t
to find the x intercepts equate to 0 and silve for t
-5t^2 + 45t= 0
-5t(t - 9) = 0
t = 0 and 9 These are the x intercepts
the vertex can be found by converting the function to vertex form
(ht) = -5(t^2 - 9t)
= -5[ (t - 4.5t)^2 - 20.25]
so the coordinates of the vertex are t = 4.5 and h(t) = -5 * -20.25 = 101.25
( 4.5 , 101.25)
The maximum height is 101.25 m and time it takes to reach this height is 4.5 seconds.