book Maths Puzzle Numerical Ability

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4) For a fixed rate, a fixed principal amount, and a fixed compounding cycle, the return is an exponential function of time. Using the formula, , let r =

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In 1950, a gallon of gas cost 25 cents. In 1986, the cost had risen to $1.02 per gallon. Assume that the cost of gas varies exponetially with time.

a) Define the variables, writ I need a help.

Use the method of "Completing the Square" to solve the following quadratic equations:

3x(x-1)=4