Select the correct answer.

Carl, Caitlyn, and Daryl are comparing their ages. Carl is two years older than Caitlyn. Daryl is five years older than Carl. The product of Carl and Daryl's ages is at least 160. If [tex]$x$[/tex] represents Caitlyn's age, which inequality represents this situation?

A. [tex]$x^2+2x+5 \geq 160$[/tex]
B. [tex][tex]$x^2+14x+28 \geq 160$[/tex][/tex]
C. [tex]$x^2+4 \geq 160$[/tex]
D. [tex]$x^2+9x+14 \geq 160$[/tex]



Answer :

Sure, let's start by translating the ages into algebraic expressions based on the information provided:

1. Carl's age: Let [tex]\( x \)[/tex] be Caitlyn's age. Since Carl is 2 years older than Caitlyn, Carl's age is [tex]\( x + 2 \)[/tex].

2. Daryl's age: Since Daryl is 5 years older than Carl, Daryl’s age is [tex]\( (x + 2) + 5 = x + 7 \)[/tex].

The next step involves setting up the inequality based on the product of Carl and Daryl's ages, which needs to be at least 160:

[tex]\[ (x + 2)(x + 7) \geq 160 \][/tex]

Now, let's expand this product:

1. First, distribute [tex]\( x + 2 \)[/tex] and [tex]\( x + 7 \)[/tex]:

[tex]\[ (x + 2)(x + 7) = x^2 + 7x + 2x + 14 \][/tex]

2. Combine like terms:

[tex]\[ x^2 + 7x + 2x + 14 = x^2 + 9x + 14 \][/tex]

So, the inequality simplifies to:

[tex]\[ x^2 + 9x + 14 \geq 160 \][/tex]

The correct inequality that represents this situation is:

[tex]\[ x^2 + 9x + 14 \geq 160 \][/tex]

Thus, the correct answer is:

[tex]\[ \boxed{x^2 + 9x + 14 \geq 160} \][/tex]