Determine whether f: zx z → z is one-to-one? is onto?
a) f(m, n) = 2m -n.
b) f(m, n) = m2 -n2.
c) f(m, n)=m +n +1.
d) f(m, n) = \m| - inl.
e) f(m, n) = m2 - 4.

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?

Astocks price gained 3% in april and 5% in may and then lost 4% in june and 1% in july during which month did the stocks price change the most