Answer:
2. "two thirds of the fourth power of r"
4. n + 14
6. 7 +11n
8. (2/5)n^2
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7. 28
8. 1/5
Explanation:
2. "two thirds of the fourth power of r"
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4. "sum" means the listed items are added. You can use any convenient variable to represent "a number." I often use n for number.
n + 14
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6. "7 more than" means 7 is added to whatever follows. "11 times a number" means the number is multiplied by 11.
7 + 11n
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8. "of" means "times". The square of a number is that number to the power of 2.
(2/5)n^2
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7 & 8 (evaluation). Your calculator can do this. (If not, get one that can.) Note that parentheses are needed around numerators and denominators and anything else that must be treated as a single value.