The table below shows the price for different numbers of notebook:

number of notebooks price (in $)
2 12
3 18
4
5 30

what price should 4 notebooks cost if the relationship represented is proportional?
i will give

Rose and andrew are financing $128,000 to purchase a condominium. they obtained a 15-year, fixed-rate loan with a rate of 5.05%. they have been given the option of purchasing up to four points to lower their rate to 4.81%. how much will the four points cost them?