Question

the units for each input and the result are given in parentheses ().
if you dont know what make a conversion factor and use a conversion factor mean in the pull-down menus, click the check answers button and read the concepts lesson.
arthur is going to purchase a plane ticket from a website. he wants to know what the total cost of the airfare and the booking fee will be combined. choose the action that arthur should use to do this calculation.
samir has several roommates and needs to figure out how much each person owes for this months electric bill. choose the action that samir should use to do this calculation.
jesse is making a purchase from an online store. he has a store credit to cover part of the purchase and will put the rest of the cost on his credit card. he wants to know how much the charge on his credit card will be. choose the action that jesse should use to do this calculation.
sandra wants to estimate how long it will take her to transcribe several pages of notes. choose the action that sandra should use to do this calculation.
erkan made a hug... e how much there is for each guest. choose the action that erkan should use...

Explanation:

Step1: Arthur's calculation logic

Total cost = Booking fee + Airfare, so use add.

Step2: Samir's calculation logic

Cost per person = $\frac{\text{Total bill}}{\text{Number of roommates}}$, which uses a conversion factor to turn total cost into per-person cost, so use make conversion factor.

Step3: Jesse's calculation logic

Credit card charge = Total cost - Store credit, so use subtract.

Step4: Sandra's calculation logic

Total time = Time per page × Number of pages, which uses a pre-set time per page to scale to total time, so use use conversion factor.

Step5: Erkan's calculation logic

Ounces per guest = $\frac{\text{Ounces of punch}}{\text{Number of guests}}$, which uses a conversion factor to turn total ounces into per-guest ounces, so use make conversion factor.

Answer:

1. Arthur: add
2. Samir: make conversion factor
3. Jesse: subtract
4. Sandra: use conversion factor
5. Erkan: make conversion factor