For starters, 700 and 600 are different
Let's set up two equations:
x+y=20 We know she brought total of 20, some of each so x=small y=big
20x+ 30y=450
x+y= 20
-y -y
------------
x= 20 -y
substitute into the other equation:
20 (20-y) + 30y = 450
400 - 20y + 30y = 450
400+ 10 y = 450
10 y = 50
y= 5
So she brought 5 big cases. Then substitute the value of y into one of the equations.
5+ x = 20
x= 15
So we bought 15 small cases and 5 big cases.
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Answer: The mathematical expectation of Option A is 2.25. The mathematical expectation of Option B is 2.75. Option B offers a greater likelihood of advancing to the finish line.
Step-by-step explanation: I took the test.
The company spends $649 on advertising
The sales function after advertising is given as:

When the total sales is $19,100, we have S(x) = 19100
So, the sales function becomes

Subtract 5 from both sides

Divide both sides by 7

Take exponents of both sides


Subtract 1 from both sides

Hence, the company spends $649 on advertising
Read more about functions at:
brainly.com/question/12940982