exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (-4, 0) and (-4, -2).

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exam Other Question

The question in my homework is:
Write the answer using positive exponents only
[2x5y^-4/3y^-2]^2

I know I need to flip to make them positive but have been wracking my brain trying to figure out where to go from there
How many liters each of a 2% salt solution and an 10% salt solution must be combined to produce 30 liters of a 4% salt solution?