1. Fid the standard form for the equation of a circle (xh)2+(yk)2=r2 with a diameter that has endpoints of (0,9) and (4,8). h= k= r= 2. Fid the equation of the circle that has center (4,6) and is tangent to the y-axis. Write it in the form (xh)2+(yk)2=r2 and identify h, k, and r. h = k = r = 3. Suppose f(x)=x1/x+2. Then f1(x)= . 4. The number of bacteria in a refrigerated food product is given by N(T)=28T246T+5, 2