exam Maths Puzzle Numerical Ability

Can you help me with these problems.

1. Simplify: 5 √2 - √2

2. Divide: 3^8/3^4

3. Simplify: (a^-4) ^5

4. Find the value of: 4xy^2 + 3x^2y^3 when x=-1 and y=

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exam Other Question

1.Rita works in a fastfood center where she earns 24 pesos per hour.Make a table that relates the number of hours that she works(x)and her pay f(x).Then draw the graph that shows t how would I solve this, write it in simplest form, and rationaliz all denominarots?

square root of K squared M to the fourth, divided by the square root of K to the fifth.