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Math Help!?
Suppose you can stay in the sun for x minutes without burning when you don't put on any lotion. A certain lotion has an SPF of 15. This translates to an algebraic expression 15x which describes how long you can tan without burning. If you normally can stay in the sun for 30 minutes without burning, How long can you stay in the sun wearing an SPF of 15. Use the algebraic expression to answer this question, showing your work fully and write your answer as a complete sentence.
1 Answer
- 6 years ago
Define variable: x = number of minutes you can stay in sun.
Expression for how long you can stay in sun with sunscreen: 15x
If you can ordinarily stay in the sun for 30 minutes, substitute:
30 = x
=> 15x = 15*30 = 450 minutes.
Thus, when using a lotion with an SPF of 15, one can stay in the sun for 450 minutes (7.5 hours) without burning.
