Can someone please help me with this question a(5)=3+(5-1)*1.5
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We just replace the "x" with the starting number (in this case "3").
Whenever you're interested in computing the (absolute) difference between two values of a certain variable, you have to subtract the final value and the initial value. This is often written as delta:
So, in this case, the final temperature is -30°F. The initial temperature is 115°F. So, the variation is
A negative delta indicates that the value decreased, which is our case.