y+7= -2/5 (x-10) what is the standard form of the equation for this line?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

If you could answer these your a life saver