In Triangle ABC, Segment AB is congruent to segment BC, and the measure of angle A is 39 degrees, what is the measure of angle C

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.