David was thinking of a number. David doubles it, then adds 3 to get an answer of 81. 6. What was the original number?.

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 constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Which of the following contains a variable?