I would like some help ​

What number produces an irrational number when multiplied by -1.25

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Find the equation of a line whose slope is 2/5 and y- intercept is 2.write your answer in the form 1) ax+by+c=02) x/a+y/b=1