Pllease help me find the answer to the question

length of a rectangle is triple its breadth, its breadth is 7 meters less than its length. what is the correct equation to find the breadth of the rectangle
(assume let 'x' be the breadth of the rectangle)

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 r i 4.5+10r=-6.5 with work pls

The relative growth rate for a certain type of fungi is 60% per hour.a small culture has formed and in just 6 hours the count shows to be 20,273 fungi in the culture.what is the initial number of fungi in the culture?