unit 7 Test corrections

The time to complete a project varies inversely with the number of employees. If 3 people can complete the project in 7 days, how long will it take 5 people?

• t = 4.2 days

• t = 21 days

• t = 5 days

• t = 3 days

The volume V of a gas kept at a constant - temperature varies inversely with the pressure p. If the pressure is 24 pounds per square inch, the volume is 15 cubic feet. What type of variation problem is this and which is the formula?

Write the equation for the table given.

• direct variation
• inverse variation
• neither direct nor inverse variation

• direct variation
• inverse variation
• neither direct nor inverse variation

The equation 
xy =  25  represents:

• direct variation
• inverse variation
• joint variation
• none of these

Is the given table a direct variation? If so, what is the constant of variation?

• Yes; 1/3
• Yes; 3
• Yes; 5
• No

2. If p varies directly as q and p = 18 when q = - 6, then k is __________.

• A. -3

• B. -1/3

• C. 1/3

• D. 3

When renting a limo for prom, the number of people varies inversely with the cost per person. Originally there were 6 people and the cost per person was $48. If the number of people changed to 12, what would be the new cost per person?

• $24

• $96

• $8

• $4

12 workers can complete the paintings in the facade of the new building in 5 days. If the painting would request for the job to be done within 3 days time only, how many workers must be hired to do the work?

• 10 workers

• 15 workers

• 18 workers

• 20 workers