Plz help (will make brainliest!)

The surface area of the triangular prism is .

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.