Identify whether the following quadratic opens upward or downward
function.
y=-2x2 + 8x - 9

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

If eh = hg and hg=16, find the diameter of k