exam Maths Puzzle Numerical Ability

A company is selling a natural insect control that mixes ladybug beetles and praying mantises in the ratio of 7 to 4. If there are a total of 110 insects per package, how many of e

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please help

evaluate

a - absolute vale of b a^2 - ba if a = -3 and b = -4 Multiply the fraction:

2x^2-x-3 3x^2-11x-20
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3x^2+7x+4 4x^2-9

I am completely lost on this one....to many numbers or letters I am not sure. Thank you for the wonderful help :-)