exam Maths Puzzle Numerical Ability

3x + 5y = 20
5x - 3y = -3

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exam Other Question

(e^-X)(X^5)/5! = .174785

Solve for X

Answer should be 2.5, but I need to know the steps for solving powers in equations.
Thank you. jan had $248.10. she gave 8% to jill. how much did she give?