Which of the following math statements contain variable(s)? Check all that apply. 3+=9​

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

What is not true about kl and mn? what is mn? (show )

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)