book Maths Puzzle Numerical Ability

If Cos A = 3/5 and A is in the first quadrant, find cos 2A.

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book Other Question

(+36)divided by (-6)= the answers are.....-6, 6, 30, or -30 identify the number of terms in each algebraic expressions
1.3xcubed 4
2.-42+x
3.xsquared 2+2xy+y squared 2
4.x+1
5.(m+n+p)squared 2
6.(a+b)
7.(x-y)(x+y)
8.4m-5n+3p+21
9.2