Which is the better buy? 3 1/3 for $10.50 or 2 1/2 for $6.25

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

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?

What is the t intercept of the line given by the equation below y= -10x + 14