x: 3
y: 5
xd: 4.6
yd: 9.2
x + y: 8
x - y: -2
x * y: 15
x / y: 0.6
isFinite(xd): true
isFinite(myInf): false
isFinite(Infinity): false
Math.abs(-2): 2
Math.floor(1.5): 1