exam Maths Puzzle Numerical Ability

I have to find the class width,class midpoints,and class boundaries for the fequency distribution.
daily precipatition frequency
0.00-0.49 31
0.50-0.99

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exam Other Question

Factor theswe polynomials completely

54. 2x^2 -x - 10
80. 4m^2 + 20 + 25
60. 10a^2 + ab - 2b^2
x-2 x+5
___ * ______
x-5 x-2

I need to multiply this can you show me how to solve
Thank you