exam Maths Puzzle Numerical Ability

For each of the following, find the vertex by completing the square:
a) y=-3x^2-6x+4
b) y=4x^2-12x-2
c) y=1/3x^2+2x-1
CAn someone please help me ??

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exam Other Question

Hi, can someone please help me graph the following:

1. x - 2y >= 4

2. y = 2x - 6 how would u write a linear equation for this: the number of calories a person burns doing an activity is directly related to the time (in minutes) the person spends dong the activity. A person weighting 160 lbs burns 73 calories dancing for 20 minutes