Temperature increase

If the temperature at 9:am is 50 degrees. What is the temperature at 5:00pm if the temperature increases 4 degrees Fahrenheit each hour?

Correct answer:

t =  82 °F

Step-by-step explanation:

$t=50+4\cdot ((12.00+5.00)-9.00)=82^{\circ }\text{F}$

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