exam Maths Puzzle Numerical Ability

I am stumped on these two problems. I am not sure how to solve them.

simplify..

sqrt 7 x ^ 2
my answer for this is... x sqrt 7x

3 sqrt 486
can this one even be simplified?

Read Solution (Total 0)

exam Other Question
two numbers equal 92 the difference between the two numbers is 21 How long would it take a runner to complete a 10km race if a pace of 6.5 min/mile were maintained?