Find the number of terms of the serier 21,18,15,12which can be taken to give a sum of zero

Write an equation of the line given the two points below (write your equation in slope-intercept form, y=mx+b): (-4, 4) and (6, -4)

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

12x + 1 = 25 solve the following equation. then place the correct number in the box provided.