The sum of two numbers is four and their product is ten. If one number is x, write an expression for the other number

4y - y^2 = 10

Step-by-step explanation:

Let x and y be the two numbers

x+y = 4

xy = 10

Taking the first equation and solving for x

x = 4-y

Substituting this into the second equation

(4-y) *y = 10

4y - y^2 = 10

i believe the answers 600m

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.