Pleas i rlly need the answer! and i don't understand this one bit!

Find the missing factor. 7s2 + 25s + 12 = (s + 3)( ).

Which of the following is not a subset of {1,2,3}?

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)