By what number must you multiply a quantity in order to increase it by 25% in a single step?

5/4

Step-by-step explanation:

Lets suppose a quantity A that has a value of x

A = x

25% of A is = x/4

now adding this 25% to get 25% increase in the original value

A' = x+ x/4

    A' = 5x/4

    A' = 5*A/4

This means that , in order to increase the value by 25%  in a single step we must multiply the the original value by 5/4.

13

step-by-step explanation:

distance formula is d=√(x2-x1)^2   +   (y2-y1)^2