Desta wants to purchase "The Ultimate Plan" from her cell phone provider. If she enrolls in this plan, she can purchase the latest cell phone from the provider for $250. The plan
consists of unlimited talk and text and 18GB of data for $100 per month. It will cost an
extra $20 per month to add her husband's phone to the plan and an extra $10 per
month to have her tablet connected.
a. Set up Desta's monthly cost function for this plan. Let x represent the number of
months she has been on the plan,
b. What will be her average cost per month be after being on the plan for 3 months?
c. Approximately how many months does Desta have to be in the plan for her average
monthly cost to be $140?

Simplify this expression.2(10) + 2(x – 4) a. 2x + 16 b. x + 12 c. 2x + 12 d. x + 16

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?

Is the power produced directly proportional to the wind speed, give reasons for your answer?