If the standard deviation of a data set was originally 4, and if each value in the data set was multiplied by 8.5, what would be the standard deviation of the
resulting data?

A.9
B.34
C.4
D.13

You can find the constant of proportionality by finding the ratio of

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²