What is the value of 2.3​

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

Acircle has a circumference of 28.36 units what is the diameter of the circle

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?