Amanda puts $1800 into an account that does not earn any interest. Every month after that, she deposits the same amount of money. This sequence
represents her account balance for the first few months:
$1800, $2000, S2200,..
What is the explicit formula for the amount of money in her account at the
beginning of month n?

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)