exam Maths Puzzle Numerical Ability

Mrs Tan bought a DVD player and a HI-FI set at a discount of 20%. She paid a total of $2800. If the price of the DVD player is 40% that of the HI-FI set, what was the price of the DVD player before the discount?

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Hello I am struggling with this question in my college course work any help would be appreciated...

(e^x)^4 e^5
____________= 3

e^2x What is the equation of the line whose slope is -4 and whose y - intercept is 5?