Answer:
2.05hrs
Step-by-step explanation:
Given he total cost c(x) of hiring a dump truck and an operator is described by the function c(x)=300+31x-3.90x^2 , where x is the number of hours worked. If c(x)=$220, then;
220 = 300+31x-3.90x^2
300+31x-3.90x^2 - 220 = 0
3.90x^2 + 31x - 80 = 0
x = -31±√31²-4(-80)(3.9)/2(3.9)
x = -31±√961+1.248/7.8
x = -31±47/7.8
x = -31+47/7.8
x = 16/7.8
x = 2.05
hence the number of working hours is 2.05hrs
Answer:
24.46
Step-by-step explanation:
cause yea, its true
Answer:
d
Step-by-step explanation:
The second value of the ratio is guests, which is currently 3. To make this 30, you would multiply it by 10, and do the same to the first value, representing bouncy balls, to get the number of balls necessary for 30 people to maintain the same ratio. 9 * 10 = 90, so 90 balls would be required if the same ratio is to be kept.
Answer:
(-1,8)
Step-by-step explanation:
It would be (-1,8) because when flipping over an axis it makes the other axis negative.