Help me do the ones marked in red.

  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

Step-by-step 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.

1.5%

step-by-step explanation: