book Maths Puzzle Numerical Ability

In triangle ABC, AD:DB=AE:EC
If AB = 25, AD = 19, and AE = 8, find EC
(Hint. First find DB by DB = AB - AD)

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book Other Question

find dy/dx

e^xy-ex^3 = 4y^2
Please help me to: write an equation for a line through (2,2), y intercept 10. Thank you.