Stephen and Rocco each have apps on their phones.
• The number of apps on Stephen’s phone can be represented by x.
• The number of apps on Rocco’s phone is 4 times the number of apps on Stephen’s phone.
• The total number of apps on both boys’ phones is at least 45.
What is the solution set for x, the number of apps on Stephen’s phone?
Let's represent the number of apps on Stephen's phone as x.
Then, the number of apps on Rocco's phone is 4 times the number of apps on Stephen's phone, which means Rocco has 4x apps.
The total number of apps on both boys' phones is at least 45, so we can set up the equation:
x + 4x ≥ 45
Combining like terms, we get:
5x ≥ 45
Dividing both sides by 5, we have:
x ≥ 9
So, the solution set for x, the number of apps on Stephen's phone, is x ≥ 9.