20. Describe two different ways that you could represent the number 0.80.

26. The double cheeseburger problem. Fast Fried foods has a special on double cheeseburgers. The first double cheese burger costs $3, the second double cheeseburger cost $2, and any other cheeseburgers purchased by the same person cost $1.50 each. mrs Cooper wants to buy 4 double cheesburgers for her family and a $1.00 soft drink for each double cheeseburger purchased, Tax on the purchase is 7%. How much change will she receive if she gives the cashier $20?

28. Give a convincing argument tha the advertisement encouraged the reader to engage in invalid reasoning.

Advertisement: If you want your skin to stay smooth, use Wrinkleflee cream morning and night. People who use Wrinkleflee treat their skin with loving care.

Reader’s interpretation: If you use Wrinkleflee cream morning and night, then your skin will stay smooth, but if you don’t use Wrinkleflee, then you don’t treat your skin with loving care.