Respuesta :
20 + 0.10x < = 40
0.10x < = 40 - 20
0.10x < = 20
x < = 20 / 0.10
x < = 200
so ur answer is : D
0.10x < = 40 - 20
0.10x < = 20
x < = 20 / 0.10
x < = 200
so ur answer is : D
Answer: D) 20 + 0.10x ≤ 40; She can send 200
Step-by-step explanation:
Hi, to answer this question we have to analyze the information given part by part:
- Cell phone plan: $20
- Price per message: $0.10
So, if the number of messages is the variable (x), the money that she spends per month is the sum of the cell phone plan ($20) and the number of text messages sent (x) multiplied by the price of each text ($0.10).
Mathematically speaking:
20 + 0.10x
She does not want to spend more than $40 on her cell phone bill.
So, the expression must be equal or less (≤) than $40:
20 + 0.10x ≤ 40
Solving:
20 + 0.10x ≤ 40
0.10x ≤ 40-20
0.10x ≤ 20
x ≤ 20 / 0.10
x ≤ 200
She can send 200 text messages.
The correct option is D) 20 + 0.10x ≤ 40; she can send 200 text messages.