### All SAT II Math II Resources

## Example Questions

### Example Question #122 : Mathematical Relationships

Add in modulo 9:

**Possible Answers:**

**Correct answer:**

In modulo 9 arithmetic, a number is congruent to the remainder of its division by 9.

Since

and

,

,

making "5" the correct response.

### Example Question #1 : Other Mathematical Relationships

varies directly as and inversely as .

If and , then .

To the nearest whole number, evaluate if and .

**Possible Answers:**

Insufficient information is given to answer the question.

**Correct answer:**

varies directly as and inversely as . This means that for some constant of variation ,

Alternatively,

We can substitute the initial conditions for thevariables on the left side and the final conditions for those on the right side, then solve for :

### Example Question #2 : Other Mathematical Relationships

varies directly as both and the square of .

If and , then .

Evaluate if and .

**Possible Answers:**

**Correct answer:**

varies directly as both and the square of . This means that for some constant of variation ,

.

Alternatively stated,

.

We can substitute the initial conditions for the variables on the left side and the final conditions for those on the right side, then solve for :

### Example Question #1 : Other Mathematical Relationships

Evaluate .

**Possible Answers:**

The system has no solution.

**Correct answer:**

Rewrite the two equations by setting and and substituting:

The result is a two-by-two linear system in terms of and :

This can be solved, among other ways, using Gaussian elimination on an augmented matrix:

Perform row operations until the left two columns show identity matrix . One possible sequence:

and . In the former equation, substitute back for , and raise both sides to the power of 4:

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