exam Maths Puzzle Numerical Ability

Solve for R?

100=70/(1+R)+60/(1+R)^2

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exam Other Question

1)solve 9*6t=9/36
2) solve In p=6.0
3) using the formula R-0.17 + 0.44 log N, determine how many choices would result in a reation time of 0.42 seconds. Round your answer to the nearest whole number.
solve for x:

5x-9=8x+6