which quadratic function only has one x-intercept?

a f ( x ) = x 2 − 12 x + 36

b f ( x ) = x 2 − 13 x + 36

c f ( x ) = x 2 + 13 x + 36

d f ( x ) = x 2 + 20 x + 36

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.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

Ok a point t on a segment with endpoints d(1, 4) and f(7, 1) partitions the segment in a 2: 1 ratio. find t. you must show all work to receive credit.