Answer:
The donuts cost $0.75 and the cookies cost $0.6
Step-by-step explanation:
You need to create a system of equations:
20d + 30c = 33
5d + 2c = 4.95
Now, let's isolate the cookies on the second equation:
2c = 4.95 - 5d
Multiply it per 15 to get the value of 30 cookies:
30c = 74.25 - 75d
Substitute in the first equation:
20d + 74.25 - 75d = 33
-55d = -41.25
d = -41.25/-55
d = 0.75
Now substitute the value of d in the second equation to find the value of c:
5•0.75 + 2c = 4.95
3.75 + 2c = 4.95
2c = 4.95 - 3.75
2c = 1.2
c = 1.2/2
c = 0.6
Number of hours Babysitting: x
Number of horus Lifeguard: y
<span>Susan makes $5 per hour babysitting
</span>Money she makes Babysitting: 5x
Susan makes $7 per hour as a life guard
Money she makes as a life guard: 7y
Total money she mahes: 5x+7y
<span>Her goal is to make at least $140:
5x+7y>=140
Answer: First option
5x+7y>=140</span>
2b+25c+12 is a simplified version of that
