exam Maths Puzzle Numerical Ability

if f(x)=4x-3, find the following

f(-1)

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exam Other Question

evaluate each expression for tha given values of the variables

4t-3s^2+s^3 for t=-2 and s= -3
Given: angle DEG = (x +3y)
angle GEF = (2x+y)
angle DEF is a right angle

a. solve for y in terms of x
~My answer= I HAVE NO CLUE AS TO SOLVING THIS S