Two cars are traveling in the same direction. the first car is going 40 mi/h and the second car is going 55 mi/h. the first car left 3 hours before the second car. which equation could you solve to find how many hours it will take for the second car to catch up to the first car? a 40t+ 3 = 55t b 40t + 120 = 55t c 55t + 165 = 40t d 55t+ 3 = 40t

10% of 1,900,000. show me how you got the answer

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?