The formula d = 8t – 9 expresses a car's distance in feet) from a stop sign, d, in terms of the number of seconds t since it started moving. Determine the car's average speed over each of the following intervals of time.

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Which expression is not a polynomial?

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?