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ISEE Upper Level Quantitative : Operations

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

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All ISEE Upper Level Quantitative Resources

8 Diagnostic Tests 234 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #893 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Which is the greater quantity?

(b) $(-7) \cdot x+ (-4)$

Possible Answers:

It cannot be determined which of (a) and (b) is greater

(a) and (b) are equal

(b) is the greater quantity

(a) is the greater quantity

Correct answer:

(a) is the greater quantity

Explanation:

Suppose is nonnegative.

Then |x| = x .

Consequently,

which must be positive,

and

$(-7) \cdot x+ (-4) = -7x-4$ ,

which is the opposite of 7 x +4 and consequently must be negative. Therefore, (a) is greater.

Suppose is negative.

Then |x| = -x .

Consequently,

and

$(-7) \cdot x+ (-4) = -7x-4$ .

4 > -4 , so

-7x+4> -7x-4 ,

and (a) is greater.

(a) is the greater quantity either way.

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Example Question #52 : Variables

Define f (x) = 3x . The graph of g(x) is a line with slope $\frac{1}{2}$ .

$(g \circ f) (2) = 6$ .

Which is the greater quantity?

(a) f(2)

(b) g(2)

Possible Answers:

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

(a) is the greater quantity

(b) is the greater quantity

(a) and (b) are equal

Correct answer:

(a) is the greater quantity

Explanation:

f (x) = 3x , so $f (2) = 3 \cdot 2 = 6$ .

$(g \circ f) (2) = 6$ , so, by definition, g[ f (2) ] = 6 , or g(6) = 6 .

The graph of g(x) is a line through the point with coordinates (6,6) and with slope $\frac{1}{2}$ . The equation of the line can be determined by setting $g(x) = x = 6 , m = \frac{1}{2}$ in the slope-intercept form:

g(x) = mx+ b

$6 = \frac{1}{2} \cdot 6+ b$

6= 3+ b

b = 3 .

The equation of the line is $g(x) = \frac{1}{2} x+ 3$ , which makes this the definition of g(x) . By setting x= 2 ,

$g(2) = \frac{1}{2} \cdot 2+ 3 = 1 + 3 = 4$ .

Therefore, f(2)> g(2)

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Example Question #13 : How To Add Variables

x- y = 125 ; and are both positive.

Which is the greater quantity?

(a) | y - x|

(b) | y + x|

Possible Answers:

(a) and (b) are equal

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

(b) is the greater quantity

(a) is the greater quantity

Correct answer:

(b) is the greater quantity

Explanation:

If x- y = 125 ,

then

y - x = - (x-y) = -125 .

The absolute value of a negative number is its (positive) opposite, so

|y - x |= | -125| = 125

Also, if and are both positive, then y + x is positive; the absolute value of a positive number is the number itself, so | y + x| = y+ x . Since x- y = 125 , it follows that x = 125 + y . Therefore,

| y + x| = y+ x = y + (125+y ) = 125 + 2y

Since is given to be positive,

125 + 2y > 125 .

and

| y + x| > |y - x|

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All ISEE Upper Level Quantitative Resources

8 Diagnostic Tests 234 Practice Tests Question of the Day Flashcards Learn by Concept

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ISEE Upper Level Quantitative : Operations

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

All ISEE Upper Level Quantitative Resources

Example Questions

Example Question #893 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Example Question #52 : Variables

Example Question #13 : How To Add Variables

All ISEE Upper Level Quantitative Resources

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