exam Maths Puzzle Numerical Ability

Solve fir r: r with the exponent of 2 + 5r - 14 = 0

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exam Other Question

Well, im just having a problem getting the General idea.
Do i combine the Measure of Angle A and B in the problem to = 90?
or do i use one to find the other?
Thanks in Advance For a function of the form y=a(b)^x to produce a decay curve, what must be true about b? (Assume a is greater than 0): (a)b is less than 0 (b) b is greater than 0 (c) 0 is less than b is less than 1 (d) b is greater than 1.