Select all of the following that are quadratic functions.

x = 3y2 – 6y + 5

y + 3 = –2 x 2+ 5

y = 2 x 2 – 8 x + 6

y= –7 x – 4

y – 3 x = 4 x 3 – x2 + 9

y = 5 x(x + 9) – 8

y – 2 x 2 = 3 x – 2 x 2 + 4

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Given abcd ac=38 and ae=3x+4 find the value of x

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?