exam Maths Puzzle Numerical Ability

Help me please!! I dont understand how to do this with a fraction:

4a+3/4=19/4

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exam Other Question

a ramp in a multistory car park is 62 feet long and rises 11 feet. etimate the angle that the ramp makes with the horizontal.
thanks a bunch
i hope you can help
Use rational exponents to simplify. Write the answer in radical notation, if possible.

root( 12, a10 )