Find an equation equivalent to x^2-y^2=4 in polar coordinates

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16

If angle ase measures 168 degrees, find the measure of angle dse. the figure mag not be drawn to scale