# 1326 question 8

• Test Prep
• paullinha32
• 26
• 88% (25) 22 out of 25 people found this document helpful

This preview shows page 13 - 19 out of 26 pages.

Question Correct 8.75 points out of 8.75 Write the logarithmic expression as a single logarithm with coe±cient 1, and simplify as much as possible. 6 log t - 4 log u - 5 log v Select one: 7 7 7 8 a. log $$( \frac{3t}{10uv})$$ b. log $$( \frac{t^6}{u^4v^5})$$ c. log $$( \frac{15tv}{2u})$$ d. log $$( \frac{t^6v^5}{u^4})$$ The correct answer is: log $$( \frac{t^6}{u^4v^5})$$ 7 7 7 7 7
13/26
3/9/2020 Graded Exam #4 Question Correct 8.75 points out of 8.75 Solve the equation. Write the solution set with the exact values given in terms of natural or common logarithms. Also give approximate solutions to 4 decimal places, if necessary. 4 = 77 ; use natural logarithms Select one: t 9
14/26 The correct answer is: ; t = 3.1334
3/9/2020 Graded Exam #4 Question 10 Correct 8.75 points out of 8.75 Solve the problem. If the half-life of an element is 67 yr and the initial quantity is 3 kg, write a function of the form Q ( t ) = Q e to model the quantity of the element left after t years. Round k to 4 decimal places. Select one: 0 - kt e e e e e
15/26
3/9/2020 Graded Exam #4 Question 11 Incorrect 0.00 points out of 8.75 Solve the problem. A pharmacist wants to mix a 16% saline solution with a 26% saline solution to get 15 L of a 20% saline solution. How much of each solution should she use? Select one:
16/26
3/9/2020 Graded Exam #4 Question 12 Correct 8.75 points out of 8.75 Solve the system of equations by using the substitution method. 3( x + y ) = -7 - 9 x - 1 = 8 + 3 y Select one: y a. $$\lbrace{(0, -\frac{1}{3})}\rbrace$$ b. $$\lbrace{(-\frac{7}{3},0)}\rbrace$$ c. $$\lbrace{(\frac{1}{3},-2)}\rbrace$$ d. $$\lbrace{(-\frac{7}{3},-\frac{1}{3})}\rbrace$$ The correct answer is: $$\lbrace{(\frac{1}{3},-2)}\rbrace$$
17/26
3/9/2020 Graded Exam #4