PLZ HELP Explain the difference between -2^4 and (-2)^4, and evaluate each power

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Use your exponent rules to express as a single power, 94 ÷ 27^2

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points