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.

chester wants to calculate how much weight he lost this summer. choose the action that chester should use to do this calculation.
weight at the end of the summer (lbs)
total weight loss (lbs)
weight at the beginning of summer (lbs)
a scientist is studying how fast a runner burns calories. choose se to do this calculation.
total calories burned (cal)
total running time (min)
add
subtract
make conversion factor
use conversion factor
susannah is trying to calculate how many bus rides she must take in order for an unlimited bus pass to be worthwhile. choose the action that susannah should use to do this calculation.
normal cost per ride ($/ride)
number of rides (rides)
cost of pass ($)
tyrone wants to calculate how much money he will spend on opera tickets. choose the action that tyrone should use to do this calculation.
cost of taxes ($)
total cost ($)
cost of tickets ($)

Explanation:

Step1: Chester's weight loss calc

To find weight lost, subtract final weight from initial weight.
Action: subtract

Step2: Runner's calorie burn rate calc

To find calories burned per minute, divide total calories by time, which is making a conversion factor of calories per minute.
Action: make conversion factor

Step3: Bus pass break-even calc

To find number of rides, divide pass cost by per-ride cost, which is making a conversion factor of rides per dollar.
Action: make conversion factor

Step4: Tyrone's total ticket cost calc

To find total cost, add ticket cost and tax cost.
Action: add

Answer:

1. Chester's calculation: subtract
2. Scientist's calculation: make conversion factor
3. Susannah's calculation: make conversion factor
4. Tyrone's calculation: add