If 9: x = x:4, then x =

Step-by-step explanation:

9:x = x :4

Product of mean =  product of extremes

x *x = 9*4

x² = 36

x² = 6²

x = 6

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

- (2, -7)

- lines r and s and lines t and u must be parallel