A parabola is a curve where any point is at an equal distance from:
<span><span>a fixed point (the focus ), and </span><span>a fixed straight line (the directrix )</span></span>
The curve is defined by: <span>y</span><span>2</span><span> = 4ax.</span>
Answer:
John = 82 Billy = 82 Gregg = 80 Bob = 55
Step-by-step explanation:
John = (3x38)+(2x0)-(2x8)-(2x8)
Billy = (3x30)+(2x4)-(2x3)-(2x5)
Gregg = (3x30)+(2x3)-(2x4)-(2x4)
Bob = (3x25)+(2x6)-(2x9)-(2x7)

➭Doing it all using mental math
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