Use your preferred strategy to find the missing terms in the arithmetic sequence. 15, , , , , 50

Which of the following statements is not true? a. parallel lines are lines in the same plane that never intersect. b. congruent figures have the same shape and same size angles and sides. c. similar figures must have the same shape and the same size. d. a rotation is when you turn a figure around a certain point.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

A50% increase followed by 33 1/2% decrease