📐 Chapter 1 (Lesson 1) Interpreting Expressions

In this expression

 $7x-9,$  what is the variable?

• 7

• 9

• x

• 7x

In this expression  $3^y+12,\$  what is the constant term?

• 3

• y

• 12

•  $3^y$  

in this expression  $90+5z,$  what is the coefficent?

• 90

• 5

•  $z$  

•  $5z$  

In this Expression

 $t=0.7n-1.3$  , what is the dependent variable?

• 0.7

• 1.3

•  $n$  

•  $t$  

A plumber charges a flat fee for each job, plus an hourly rate for the number of hours the job takes to complete. The total cost of the job, in dollars can be modeled by the equation

 $y=50+65x$  

What does the independent variable in the expression represent in this situation.

• the number of jobs, y

• the number of hours to complete the job, x

• the cost per hour, $65

• the total cost for the job, y

A plumber charges a flat fee for each job, plus an hourly rate for the number of hours the job takes to complete. The total cost of the job, in dollars, can be modeled by the equation


 $y=50+65x$  

What does the coefficient in the expression represent in this situation?

 

• the number of hours to complete the job, x

• the cost per hour, $65

• the flat fee, $65

• the flat fee, $50

A plumber charges a flat fee for each job, plus an hourly rate for the number of hours the job takes to complete. The total cost of the job, in dollars can be modeled by the equation


 $y=50+65x$  

What does the constant the constant term in the expression represent in this situation?

• the number of jobs, x

• the cost per hour, $65

• the cost per hour, $50

• the flat fee, $50

A colony of bacteria starts out with 250 bacteria and doubles in number every hour. The expression

 $n\cdot2^h$  gives the number of bacteria after h hours. What number should be substituted for n in the expression?

Ginny has 2 quarters, For every week that Ginny does all of her chores, her mother will increase the amount of money Ginny has exponentially. The Equation 
 $y=0.5\cdot3^w$  describes the amount of money that Ginny has after w weeks of doing all of her chores. What does the term  $3^w$  tell you about this situation

• Every week, Ginny's money increases by 3 quarters.

• Every week, Ginny's money increases by 3 dollars.

• Every week, Ginny's money Triples.

• Every Week, Ginny's money increases by w dollars

A scuba diver is descending at a constant rate. The expression     $-15-3m$  gives his elevation, in feet m minutes after he begins the descent. Which of the following statements is false.

• The diver's elevation is increasing by 3 feet each minute.

• When the diver begins to descent, he is 15 feet below the surface of the water.

• The coefficient represents the rate of change

• The variable represents the time in minutes.