GRADE 9 REVIEW

What kind of variation does this equation show?
y = 6x

• Inverse Variation
• Direct Variation
• No Variation
• Joint Variation

Does the equation show an inverse variation? 
y=10/x

• yes
• no

Tags

CCSS.HSF-LE.A.1B

If 32 men can reap a field in 15 days, in how many days can 20 men reap the same field?

• 18 days

• 20 days

• 22 days

• 24 days

Tags

CCSS.HSA.CED.A.1

The formula for Combined Variation is represented as:

• y = kx

• y = k/x

• y = kxz

• y = kx/z

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

Suppose y varies directly as x.
If  y = 22.5 when x = 15, find y when x = 20.

• 1.5
• 337.5
• 30
• 16.875

Write the mathematical equation of the given statement: (no spacing, use / for fraction bar)

The time (t) needed to answer a set of problems is directly proportional to the number (N) of problems, and inversely proportional to the number of students (P) working on the solutions.

1. Which of the following is the equation of variation where c varies jointly as g and f and c=24 when g=2 and f=3.

• A. K = cgf

• B. C=kgf

• C. G = kcf

• D. F=kcg

Simplify 3^-3

• -27
• -9
• -1/9
• 1/27

Tags

CCSS.8.EE.A.1

Simplify (-8)^-2

• 1/-8²

• 1/8²

• 1/64

• -64

Tags

CCSS.6.NS.C.7C