book Maths Puzzle Numerical Ability

Problem is I=PRT and I need to solve for "r" can anyone help me in describing how I do this?

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book Other Question

find the GCF 64a^10b^3,88a^5b^10 Write the slope-intercept form of the equation of the line passing through the
point (-2,3) and paralley to the line y=-5x-4.