book Maths Puzzle Numerical Ability

Find each product

2/5 * 25/18

(x + 3)/(x + 5) * (x - 2)(x + 5)/(x + 3)

x to the 2nd power + 7x + 12/ (x + 5) * ( x + 5)/ (x + 4)

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book Other Question

Hi Could you please help me to solve this problem:

Find a probability if a die is rolled 5 times: P(exactly one 5)
Find values of c so that the equation will have two solutions, one solution, and no real solution.

x^2+4x+c=0