exam Maths Puzzle Numerical Ability

Please help me with this homework question!Simplify B to the 7th power divided by B to the 2nd power times b to the 3th power.

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exam Other Question

The lengths of diagonals of a rhombus are in the ratio 2:1. If the perimeter of the rhombus is 20, find the sum of the lengths of the diagonals.

I know that each side is 5. ( 20/4=5)
I know the diagonals are perpendicular to each other. how do you skecth a graph of the inequlity of -2<_ x<_ 5