exam Maths Puzzle Numerical Ability

Please help solve 14 + (-1). The answer I got was 13. I just want to make sure that my answer is correct. I am a little rusty on this problem. Thank you for your help.

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I appreciate your help with this word problem:

A car travels from one town to another at a speed of 32 mph. If it had gone 4 mph faster, it could have made the trip in 1/2 hour less time. How far apart are the towns?

Thanks!!! you have 80 yards of fencing to enclose a rectangular region. find the dimensions of the rectangle that maximize the enclosed area. what is the maximum area?