exam Maths Puzzle Numerical Ability

Explain how to multiply and divide rational expressions.

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exam Other Question

braking cars: b= r(squared) where b is the braking distance, r is the spped
30F
and f is a road-tire friction coefficient. find F when b= 76 feet and r= 57mp
Solve following systems of linear inequalities graphically

15x+20y<300
x+y<18



Don't understand this problem at all.