someValue = 5
def letsAdd(x,y):
    addition = x+y
    return addition

print letsAdd(3,5)
print someValue

#make a function called subtraction
def subtraction(x,y,z):
    #make subtract variable equal to x - y - z
    subtract = x-y-z
    #return subtract variable
    return subtract

def multiplication(x,y):
    return x*y

def division(x,y):
    return x/y
