### Home > CCA > Chapter 4 > Lesson 4.1.2 > Problem4-25

4-25.

Write expressions to represent the quantities described below. Homework Help ✎

1. Geraldine is $4$ years younger than Tom. If Tom is t years old, how old is Geraldine? Also, if Steven is twice as old as Geraldine, how old is he?

Geraldine is 4 years younger than Tom, so Tom's age subtracted by 4 is Geraldine's age: (t − 4)

Steven is twice as old as Geraldine: 2(t − 4). Remember that Geraldine's age is equal to (t − 4).

2. $150$ people went to see “Ode to Algebra” performed in the school auditorium. If the number of children that attended the performance was c, how many adults attended?

We know that a total of 150 people attended the Ode to Algebra. There were two main groups of people
(the children and the adults) so: (150 − c) yields the amount of adults.

3. The cost of a new CD is $\14.95$, and the cost of a video game is $\39.99$. How much would c CDs and v video games cost?

• Refer to both problems (a) and (b) for help. Use what you know about the problem to create a
logical expression.