Qumt

QUMT 2342 Date ________ Name: ___________________________ ID:_____________ Exam 1 – C / Answer Key ------------------------------------------------------------------------------------------------------------------------------

1.

Find the value of the following expression

3.9 − −5.6 = 3.9 − 5.6 = −1.7

2. Evaluate the expression

3∙7 = =

3. Simplify each expression. Negative exponents may remain in the answer if they are in the

numerator. Assume that all variables represent nonzero real numbers.

∙

=

∙

=

=

=

=

4. Simplify each expression. Assume that all variables represent positive real numbers.

=

=

=

=

5. Change each expression to an equivalent expression in radical notation. Assume that each

variable expression represents a positive real number.

+7

= ∙

=

6. Perform the indicated operation and simplify the expressions.

−4 − 2 + 2 − 3 +5 = −4 − 2 + 2 − 3 − 5 = −7 −7 +2

7. Simplify the expression.

5 +2 − 3 − 3 + 7 = 5 + 2 − 6 − 3 − 7 = 4 − 13

8. Factor each expression completely. (Each factor should have integer coefficients).

9 − 16 = 9 − 16 = 3 +4 3 −4

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QUMT 2342 Date ________ Name: ___________________________ ID:_____________ Exam 1 – C / Answer Key ------------------------------------------------------------------------------------------------------------------------------

9. Write an equation in the slope-intercept form, perpendicular to 2

−2,4 .

− 4 = 5, passing through

2 − 4 = 5 → −4 = −2 + 5 →

=

+

→

= −

=−

then

=

A perpendicular line to this function will have the following slope And the new line for the new equation passes through −2, 4

−

=

−

→

− 4 = −2

− −2

→

− 4 = −2

+2 →

10. Let

Find

Since

− 4 = −2 − 4 = −2 − 4 + 4 → = −2 = , = − 2 , and ℎ = . ℎ

=

→

ℎ

=

=

11. Modeling in sales. The manager of a men’s store knows he can sell 60 pairs

of a certain style of sock when the price is $1.20...