book Maths Puzzle Numerical Ability

At 7A.M. , the temperature was -15 oF, By 1 P.M. ,the tempature had increased by 18 oF. What was the temperature at 1 P.M. ?

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book Other Question

How can I get my calculator to do a root of a number other than the just the square root. for example, the cube root of 8 is 2. My calculator only shows the square root. I have a T-89 titanium.

Thanks in advance. 1/2 kids have left party
18 kids are standing around
1/3 are dancing
how many kids were originally at party