Select all of the following functions that are quadratic.
y = 2x2
3 = 2x2 – 8
y = –2 + 2x – 8
y + 3x = 2x2 – 8
y +3x2 = 2x + 3x2 – 8

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Whats the name of the vertical axis

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z