exam Maths Puzzle Numerical Ability

I need help on properties of powers.I was asked to simplify aproblem but it is too hard to do. The problem is: (-2x/y^4)^2(10y/6x)^3

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exam Other Question

One morning, John drove 5 hours before stoping to eat. After lunch, he increased his speed by 10 mph. If he completed a 430-mile trip in 8 hours of driving time, how fast did he drive in the morning? homework:how many rooms will you fill if you charge $120 per night. find an equation of the line containing the given point having the given slope.
1.(4,-3),m=-1
2.(-7,2),m=3