Which relation is a function?(click all that apply)

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

If f(x)=x+7 and g(x)=1/x what is (fog)(x)