Let the number of hours worked be "h," then the total amount is 7h=91.
Answer:
-3 < x ≤ 7
Step-by-step explanation:
Domain is the set of x-values that can be inputted into function f(x).
We can see from the graph that our x-values that can be inputted are from -3 to 7. Since -3 is an open dot, we cannot include this in our domain.
∴ -3 < x ≤ 7
Step-by-step explanation:
multiplying the 2nd eqn by 9 we get,
9x+9y=81
then,subtracting 1st and 2nd eqn
9x+5y=41
9x+9y=81
- - -
__________
0. -4y=-40
we get y = 10
then we get x=9-y
x=9-10
x= -1
so x is -1 and y is 10
Answer:
6.7 days
Step-by-step explanation:
If t is the time the faster roofer takes, then the slower one takes 3t. Their combined rates in roofs per day are ...
1/t + 1/(3t) = 1/5
4/(3t) = 1/5 . . . . . . combine terms
t = 5(4/3) = 20/3 ≈ 6.7 . . . . multiply by 5t
The faster roofer working alone can roof a house in about 6.7 days.