Please help me with my homework!! (btw i choosed A randomly but it doesn't mean it's correct bc it's green it turns green for all all them so don't be confused about that)

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?