What is the greatest common factor of 20,30 and 55

Convert the cartesian equation (x 2 + y 2)2 = 4(x 2 - y 2) to a polar equation. choices: r4 = -4r2 r2 = 4cos2θ r2 = 4sin2θ

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form