Let f(x) = x2 − 81. find f−1(x). (1 point)

±square root of the quantity x plus 81
9 square root of x
1 over quantity x squared minus 81
x squared over 81

Describe all the numbers that when rounded to the nearest thousand are 645,000

Which of the following lines is parallel to x=4? a- 3y=9 b- y=4 c- x=2 d- x=y answer this as soon as possible xoxo lo ; )

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)