In this line of circles, the ratio of red circles to blue circles is 1:3 how many more red circles would need to be added to make the of red to blue 3:1?

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.

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle