The budget of Van for groceries for 1 week is:
12 $ (per a weekday) * 5 (weekdays) + 15 $(per a weekend day) *2 (weekend days) = 60$ +30$ = 90$
The budget of Van for w weeks is:
90 $ (per week) * w (weeks) = 90w dollars.
Answer: 90w $
C
(1, 3) is 5 units to the right of (-4, 3)
So, each serving requires:
3 1/4 divided into 13:

let's check from the second information:
4 2/4 divided into 18:

so for 28, we need:

we need 7 cups of flour!