ISEE Middle Level Quantitative : Algebraic Concepts

Study concepts, example questions & explanations for ISEE Middle Level Quantitative

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Example Questions

Example Question #22 : Equations

How many elements of the set  can be substituted for  to make the inequality  a true statement?

Possible Answers:

One

None

Four

Two

Five 

Correct answer:

One

Explanation:

 (Note that the inequality symbol switches here)

 

Of the elements of , only  fits this criterion.

Example Question #21 : Equations

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

Infinitely many

It cannot be determined from the information given

Zero

One 

Two

Correct answer:

One 

Explanation:

If , the equation can be rewritten and solved as follows:

This is the only number that makes this statement true, so the correct choice is "one".

Example Question #153 : Algebraic Concepts

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

One

Two

Zero

Six

Three

Correct answer:

One

Explanation:

If , then the equation can be rewritten and solved as follows:

The only integer that can be cubed to yield the result  is , so the correct response is "one".

 

Example Question #152 : Algebraic Concepts

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

One

Two

Zero

It cannot be determined from the information given

Infinitely many

Correct answer:

Two

Explanation:

If , the equation can be restated and solved as follows:

Both  and  make this true, so both make the original statement true. "Two" is the correct choice.

Example Question #24 : How To Find The Solution To An Equation

How many elements of the set  can be substituted for  to make the inequality  a true statement?

Possible Answers:

Five

One

Two

Three

Four

Correct answer:

One

Explanation:

Of the elements of the set , only  fits this criterion, making "one" the correct choice.

Example Question #155 : Algebraic Concepts

Which is the greater quantity?

(A) 

(B) 

Possible Answers:

(A) and (B) are equal

(B) is greater

(A) is greater

It is impossible to determine which is greater from the information given

Correct answer:

(A) is greater

Explanation:

 

 

Since .

, so (A) is greater.

Example Question #22 : Equations

If , then how many integers can be substituted for  to make the equation  a true statement?

Possible Answers:

One

Four

Zero

Two

Infinitely many

Correct answer:

Infinitely many

Explanation:

If , this can be rewritten as

However, since zero multiplied by any number yields a product of zero, this is a true statement for all values of . This makes "infinitely msny" correct.

Example Question #31 : How To Find The Solution To An Equation

Evaluate .

Possible Answers:

It is impossible to evaluate  from the information given

Correct answer:

Explanation:

We will not be able to solve for the values of and ; instead, we need to group them together by reorganizing the equation.

Start by adding and subtracting on each side. This will allow both variables to be on the left and both whole numbers to be on the right.

can be factored out of the left side.

Divide both sides by .

Example Question #151 : Algebraic Concepts

Divide 1,000 by 30. The quotient is ; the remainder is . Which is the greater quantity?

(A) 

(B) 

Possible Answers:

It is impossible to tell which is greater from the information given

(A) and (B) are equal

(B) is greater

(A) is greater

Correct answer:

(A) is greater

Explanation:

First, divide:

 and , so .

(A) is greater.

Example Question #32 : Equations

Evaluate .

Possible Answers:

It is impossible to evaluate  from the information given

Correct answer:

It is impossible to evaluate  from the information given

Explanation:

We cannot solve for and on their own. Instead, we need to reorganize the equation to find .

It quickly becomes clear that we cannot solve for with certainty.

 

If  and , then 

, since

This makes 

 

If  and , then 

, since

This makes 

 

Therefore,  cannot be evaluated with certainty.

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