exam Maths Puzzle Numerical Ability

square root of x+1 + square root of x-1
_______________________________________ = 4x-1 divided by 2
square root of x+1 - square root of x-1

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exam Other Question

Celsius temperature readings can be converted to
Fahrenheit readings using the formula F = 9/5 C + 32. What is the Fahrenheit
temperature that corresponds to each of the following Celsius temperatures: -10,
0, 15, 100?
you deposit $2000 in an account that pays 2% annual interest compounded quarterly. How long will it take for the balance to reach $2400?

I have having trouble completing this problem, please help with the steps.

Tx, H