book Maths Puzzle Numerical Ability

How long will it take for $6100 to grow to $49200 at an interest rate of 9.4if the interest rate is compounded quarterly. Round to the nearest 10th

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Need to find the cubic inch capacity of an object that is 2 inches in diameter and 18 feet long. What is the formula for solving this problem? It has been 40 years since I have had to use this formula.

Thanks for your help. Could you please help me? I have been haveing serious problems with this equation.
y=4x+1
y=4x-3
It has to be solved useing elimination, or substitution. And i have tryed both. Could you please help?