510 (a) Sketch the curve by using the parametric equations to plot points. Indicate with an arrow the direction in which the curve is traced as t increases. (b) Eliminate the parameter to find a Cartesian equation of the curve

Concrete Operational Stage ages 7-11 years old. Thought is more logical and flexible than in early childhood The child is now a socio centric aware that others have their own perspectives on the world that those perspectives are different from the child’s Reversibility Capacity to think through a series of steps and then able to reverse the direction, returning to the starting point. Lizzie understands that addition and subtraction are reversible operations When you add 7 plus 8 to get 15, then this tells you that 15 minus 8 must be 7. Classification Middle childhood starts collections during this time. • Stamps • Baseball cards • Coins • Rocks Sorting and classifying, separating in categories and sub categories. Seriation