Chapter 4: Problem 91
Solve the equation. \(-2 z=-26\)
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MULTI-STEP PROBLEM The number of people who worked for the railroads in the United States each year from 1989 to 1995 can be modeled by the equation \(y=-6.61 x+229,\) where \(x\) represents the number of years since 1989 and \(y\) represents the number of railroad employees (in thousands). a. Find the \(y\) -intercept of the line. What does it represent? b. Find the \(x\) -intercept of the line. What does it represent? c. About how many people worked for the railroads in \(1995 ?\) d. Writing Do you think the line in the graph will continue to be a good model for the next 50 years? Explain.
Evaluate the expression for the given value of the variable. (Review 1.3 and 2.5 for 4.2 ) $$4.2 t+17.9 \text { when } t=3$$
Is the given number a solution of the inequality? $$-2-x \leq-9 ;-7$$
Find the difference. $$ 7-|-1| $$
find the quotient. $$ 54 \div 9 $$
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