Plz help me with math :(

If i have one apple and give you the apple, how many apples do i have?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?