Answer:
Justin worked as a babysitter 8 hours and worked as a lifeguard 2 hours last week
Step-by-step explanation:
Let
x ----> number of hours worked as a babysitter last week
y ----> number of hours worked as a lifeguard last week
we know that
----> equation A
----> equation B
Solve the system by substitution
Substitute equation B in equation A
solve for y
Find the value of x
therefore
Justin worked as a babysitter 8 hours and worked as a lifeguard 2 hours last week
No, it's the same activity so it couldn't be about the activity type. The cost varies by day.
Answer:
it's 10
Step-by-step explanation:
i searched it up.
The equation would be: C = 5.5T, where C is the Cost and T is the number of tubes.
If you divide all of the outputs by the inputs, you will get 5.5. That means it's a proportional relationship. Just multiply the number of tubes by 5.5 and you will have your cost.
Taking the derivative of both sides with respect to 
gives
![\dfrac{\mathrm d}{\mathrm dx}[x^2]=\dfrac{\mathrm d}{\mathrm dx}[-2+y+5\cos y]](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Cmathrm%20d%7D%7B%5Cmathrm%20dx%7D%5Bx%5E2%5D%3D%5Cdfrac%7B%5Cmathrm%20d%7D%7B%5Cmathrm%20dx%7D%5B-2%2By%2B5%5Ccos%20y%5D)
When 
, we have two possible values of :
so we have two possible values 
.
