Solve for the unknown value in simplest form 2/4/5 = x/3/10

Rearrange the formula c^2 = a^2 + b^2 for b

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?