Inversely propotional

The length of a violin string varies inversely with the frequency of its vibrations. A 14-inch long violin string vibrates at a frequency of 450 cycles per second.

Find the frequency of a 12-inch violin string.

• A) 526

• B) 524

• C) 525

• D) 523

"c" varies inversely with "d". If c = 100 and d = 0.2, then write the formula for the relationship between c and d.

• A) c=19d

• B) c=20d

• C) c=-20d

• D) c=21d

Two workers take 32 hours to complete a task.

How many workers are required to perform the same task in 4 hours?

• A) 16 workers

• B) 14 workers

• C) 12 workers

• D) 18 workers

4 painters take 12 hours to finish painting a building.

How long will it take for 16 painters to paint the same building?

• A) 4 hours

• B) 5 hours

• C) 3 hours

• D) 6 hours

What type of variation does this scenario represent?
The grade you earn in a class
and the number of assignments you complete
and the number of hours you study

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

What kind of equation is this?
xy=8

• Linear Equation
• Direct Variation
• Inverse Variation
• Joint Variation

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSA.SSE.A.1

The number of hours to paint a house varies inversely with the number of painters working. A 2400-square foot house can be painted in 27 hours by 6 painters. How many painters would need to work in order to paint the house in 18 hours?

• 8 painters
• 10 painters
• 9 painters
• 11 painters

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

Which of the following represents indirect variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

Tags

CCSS.HSA.APR.D.7

CCSS.HSA.CED.A.2

Which equation shows a proportional relationship?

• y = 5x + 9
• x = 5y - 10
• y = 5x
• x = 5y + 48

Tags

CCSS.6.EE.C.9

CCSS.6.RP.A.1

CCSS.6.RP.A.2

CCSS.6.RP.A.3

What "letter" also represents the COP?

• j
• k
• m
• n

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6