Determine the constant of proportionality in each of the problems below.

y= 1 1/2x

a restaurant has an all you can eat buffet. they charge $13.95 per person.

i can't figure those two out.

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)