Which of the following equations has only one solution?

x^2 - 8x + 16 = 0
x(x - 1) = 8
x^2 = 16

Suppose a ball is dropped fromca height of 6ft. it bounces back up but time it bounces, it reaches only 7/10 of its pervious height. what is the total of each height that the ball reaches after 5 bounces

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

True or false look at the picture pls : /