Question

for each of the situations below, choose the action that will make the calculation work.
in each case, 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.
bob is planning an event and needs to purchase enough soda for all the people attending. choose the action that bob should use to do this calculation.
number of people (people)
cans of soda needed (cans)
cans of soda per person (cans/pers
a developer has a large number of to donate some of the acres to the county for a park in exchange for the right to b oose the action that the developer should use to calculate the number of acres th
donated acres (acres)
acres (acres)
initial acres owned (acres)
sarah needs to do reading for both her biology and chemistry classes and wants to know how many pages of reading she has in total. choose the action that sarah should use to do this calculation.
chemistry pages to read (pgs)
total pages to read (pgs)
biology pages to read (pgs)
options for actions: add, subtract, make conversion factor, use conversion factor

Explanation:

Step1: Analyze Bob's calculation

We have units: people × $\frac{\text{cans}}{\text{person}}$ = cans. This is multiplication, which uses the given rate as a conversion factor.

Step2: Analyze developer's calculation

We have units: initial acres (acres) - donated acres (acres) = remaining acres (acres). This is subtraction of like units.

Step3: Analyze Sarah's calculation

We have units: chemistry pages (pgs) + biology pages (pgs) = total pages (pgs). This is addition of like units.

Answer:

1. Bob's action: use conversion factor
2. Developer's action: subtract
3. Sarah's action: add