What is the expanded notation for 0.21?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Which of the following equations is of the parabola whose vertex is at (4, 3), axis of symmetry parallel to the y-axis and focus at (4, -3)? a.) y+3=1/24 (x+4)^2 b.)y-3=-1/24 (x-4)^2 c.)x-4=-1/24 (y-3)^2

What is the prime factorization of 230