exam Maths Puzzle Numerical Ability

When 3x2 - 8x + 5 is factored, one of the factors is:

x - 1
3x + 5
x - 5
3x - 1
x + 5

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exam Other Question

3y+x+4y+x-5=180
This is the problem my daughter has. 3y+x is the measure of angle ABD & 4y+x-5 is the measure of angle DBC. She must find the answer "what is the measure of angle Three coins are tossed . Find the probability that no more than one coin lands heads up. is it 5/8, 1/4, 3/8, or 1/2

How do I work this out?

Please help

Ellen