exam Maths Puzzle Numerical Ability

how do u factor a polynomial when it is a^2-4 is that prime since there are no factors that can be simplyfied is there a step by step solution?

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exam Other Question

Please tell me if I have correctly simplified the following equation.
sqrt20/5-1/sqrt5 written as a fraction the 20 is under the sqrt and over 5 subtracted from 1 over sqrt 5.

I get 1 over 5 sqrt 5.
1) Cab Fare, A taxicab charges $1.50 for the first 1/5 mi. and 30 cents for each additional 1/5 mi. Determine the cost of 10 mi. trip.

2) Flying West, New York City is on easter