Which of the following equations could model the quadratic graphed below: A. f(x) = -2x²+4x+1
B. f(x) = x²-5x-3
C. f(x) = -2x²+x-3
D. f(x) = -x²+5x+3
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What is the y intercept of f(x)=(1/2)^x?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Written as a simplified polynomial in standard form, what is the result when (2x+8)^2(2x+8) 2 is subtracted from 8x^2-38x 2 −3?