book Maths Puzzle Numerical Ability

The amount of money in a savings account decreases form $340 to $220. Find the percent decrease rounded to the nearest tenth of a percent.

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book Other Question

A swimming pool has the dimension of 32ft length x 16ft width x 5 ft depth

What is the volume in cubic centimeters I am taking college algebra online and am having problems with equations and inequalities: for example: find all real solutions by factoring:
x^3+4x^2-x-4=0

thanks
Sal