The answer is C, Step 3: He should have divided both sides by -7.
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I would say cy hopes this help
Answer:
21 years
Step-by-step explanation:
Use the equation
where x is the number of years passed.
Once you've solved for it, x=20.475319. Although it's closer to 20 years to the nearest year, it's 21 years since you'll wont reach 3000 in year 20.
Each student has 8/5 or 1.6 of the cake