exam Maths Puzzle Numerical Ability

Simplify:A) (9x(^-1/2)-x(^1/2))^2
B) x(^-2)y(3(x^-1)y^3)^4

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exam Other Question

A chemist mixed some 15% peroxide solution ith some 6% peroxide solution to make 300 ML of a 9% peroxide solution. How many milliliters of the 15% solution was used?
vector operation

if
-> -> _. ->
A= 2i -5j + 6k
->
express A as the product of a magnitude and unit vector

the cordinates of the rocket in flight are unkown.