Which of the following quadratic graphs has only one zero? y=-232 - 4x + 8
y= - 16
Oy= 22 + 8x + 16
y = 2x² – 8x
(Please help)

Need on this one asap im almost done with this subject

What is r i 4.5+10r=-6.5 with work pls

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18 }, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.