book Maths Puzzle Numerical Ability

I need to Simplify and express in simplest radical form.

How would I simplify

3 square root of 8 + 2 square root of 16

would I get the same square root number of 16 on b

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book Other Question

Solve: The sum of 35 and z The winning car in a race had an average speed of 203.7 miles per hour. This was b miles per hour faster than the second-place car. Write an expression for the average speed of the second-place car.