exam Maths Puzzle Numerical Ability

The graph of a function F(x)=mx + b contains the points (5,15) and (-3,-5). Find b.

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-6(a+5b)- 3(-7B-a)=

This is a problem from a worksheet I was given for homework. It did not come from my text book. A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on 1-hour flight is 0.02. What is the probability that both will fail, neither will fail or one or the other will fail?