exam Maths Puzzle Numerical Ability

I have these problems and in need of help . Please explane and help me . Thanks .


For f(x) = 5x - 4, find f (-1).


Perform the indicated operations:
(x2 - 4x + 1) - (-8x2 + 2x - 6) - (x2 + 3x - 5)

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exam Other Question
On my worksheet it says Radicals and Rational Exponent/Complex Numbers
Anne is pulling on a 60 foot rope attached to the top of a 48 foot tree while Walter is cutting the tree at its base. How far is it from the base of the tree is Ann standing? Triangle ADE ~ triangle ABC

Given: DE = 5, AD = 8, DB = BC
Find: AB
(Hint: Find DB first.)

I need help with the hint. I know that I need to some how set up a proportion