Math 127 College Algebra, Fall 2006 NAME:____________
EXAM 3
6 problems, 10 points each
Instructions:
1. Show enough work to justify your answers.
2. Don't leave early unless you are sure you've solved all the problems.
(a) Algebraically, show that the function
is not one-to-one. (b) Graphically, show that the function
is one-to-one. (c) Find the inverse of
Express as a single logarithm .
Suppose $1000 is deposited in the account with interest 5% compounded
annually. How long will it take to triple the
money?
Solve the equation
Set up, do not solve, the system of linear equations for the following
problem. "One serving of tomato soup contains 100 Cal and 18 g of
carbohydrates. One slice of whole bread contains 70 Cal and 13 g of
carbohydrates. How many servings of each should be required to obtain 230 Cal
and 42 g of
carbohydrates?"
Solve the following system of linear equations: .