book Maths Puzzle Numerical Ability

Show EACH step in solving each of the following equations. State if any solution is extraneous.
a. sqrt(3x + 1) = 4
b. 2x - sqrt(3x - 2) = 8
c. sqrt(2x - 1) = x - 8

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book Other Question

How would you solve this equation?

The width of a rectangle is 6 cm less than the length. The perimeter is 72 cm. Write and solve an equation to find the width and the length of the rectangle. A bacteria culture started with a count of 480 at 8:00 A.M. and after
t hours is expected to grow to f(t)=480(3/2)^2. Estimate the number of
bacteria in the culture at noon the s