The width of a rectangle is 6t-6.5 feet and the length is 6.5t+10 feet. find the perimeter

What is the range? can’t seem to find it out

Solve the triangle. a = 21°, c = 105°, c = 5

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)