When a composite number is written as a product of prime numbers we call this its what?

Which of the following circles have their centers on the x-axis? check all that apply.

X² + 4y² = 36 the major axis runs along: a) y=4x b) x-axis c) y-axis

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm.it decreased by the same amount each year. what was the change in grandpa ernie's height each year