Point m is the midpoint of ab . am= 3x+3, and ab=8x−6 what is the length of am? the answer is 21 but i don't know the steps to get it.

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

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost.swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.