Intermediate Algebra Questions With Solutions and Explanations - sample 6

Solutions and full explanations of intermediate algebra questions in sample 6 are presented.

(True or False) ((2^{2})^{3}) = 2^{5}.

Solution

Evaluate ((2^{2})^{3}) and 2^{5} .

((2^{2})^{3}) = 2^{6} = 64

2^{5} = 32

The statement "((2^{2})^{3}) = 2^{5}." is FALSE.

(True or False) The slope of a vertical line is undefined.

Solution

Let (2 , 5) and (2 , 7) being two points on the same vertical line since their x coordinates are both equal to 2. Let us find the slope through the two points.

m = (7 - 5) / (2 - 2) = 2 / 0 = undefined.

The statement "the slope of a vertical line is undefined" is TRUE.

(True or False) Two lines with positive slopes can be perpendicular.

Solution

For two lines to be perpendicular, the product of their slopes must be equal to - 1. If the two slopes are positive their product cannot be negative. Hence the statement "Two lines with positive slopes can be perpendicular" is FALSE.

(True or False) 5 > 10 or 5 < 7.

Solution

The statement "5 > 10" is false and the statement "5 < 7" is true. The whole statement "5 > 10 or 5 < 7" is TRUE since there is an "or" and one of the two statements is true.

(True or False) The set of ordered pairs {(6,4),(2,-5),(-2,4),(6,-4)} is a function.

Solution

For the first coordinate 6 there are two possible second coordinates: 4 and - 4 and therefore the statement "the set of ordered pairs {(6,4),(2,-5),(-2,4),(6,-4)} is a function" is FALSE.

(True or False) The additive inverse of -10 is 10.

Solution

The additive inverse of a number x is.

- x

The additive inverse of - 10 is.

- (-10) = 10

The statement "the additive inverse of -10 is 10" is TRUE.

(True or False) The product of two positive numbers is NOT positive.

Solution

The product of two positive numbers is positive and The statement "the product of two positive numbers is NOT positive" is FALSE.

(True or False) x + 2 = 7 is called an inequality.

Solution

x + 2 = 7 has an equal sign and is called an equation. Hence the statement "x + 2 = 7 is called an inequality" is FALSE.

(True or False) The associative property is used to write 4x + 8y = 4(x + 2y).

Solution

No. The distributive property is used to write

4x + 8y = 4(x + 2y)

The statement "the associative property is used to write 4x + 8y = 4(x + 2y)" is FALSE

(True or False) The absolute value of a real negative number is negative.

(True or False) -2^{3} = (-2)^{3}.

(True or False) 30% of x is equal to 0.03x

(True or False) "x is at most equal to 9" is written mathematically as x < 9.

(True or False) 3^{20} + 3^{20} + 3^{20} = 3^{21}

(True or False) 1.5 × 10^{-5} is the scientific notation of the number 0.0000015.

(True or False) 1000/0 = 0.

(True or False) 0/1000 = 0.

(True or False) 0.0000001^{0} = 1.

(True or False) 1 / (( -2 )^{ -4}) = 16.

(True or False) x = 7 DOES NOT satisfy the inequality x - 7 < 0