If △abc ~ △fed, which of the following statements is correct?

ab ≅ fe
bc ≅ ed
ac ~ fd
ca ~ de

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)