Which one of the following is the best example of a cognitive tool?
a) the concept of pi (π) in a geometry class
b) a jigsaw in a woodworking class
c) use of country-western music in a step-aerobics class
d) use of natural lighting in a studio art class

Which of the following is the graph of y= square root -x-3

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.

Find the arc length of the semicircle. 7the grade