Asap! 20 points! i have to pass math! from the equation, what is the value of the radius, r? x^2 + y^2 = 144 asap

Astudent simplified a rational expression as shown.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny