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Sagot :
To determine the range of gallons of water used by customers whose monthly charges range from [tex]$35 to $[/tex]55, we need to solve the inequality:
[tex]\[ 35 \leq 10.15 + 0.005x \leq 55 \][/tex]
First, let's isolate [tex]\( x \)[/tex] in the inequality by solving for [tex]\( x \)[/tex] in both the lower and upper bounds.
### Solving for the lower bound:
[tex]\[ 35 \leq 10.15 + 0.005x \][/tex]
1. Subtract 10.15 from both sides:
[tex]\[ 35 - 10.15 \leq 0.005x \][/tex]
[tex]\[ 24.85 \leq 0.005x \][/tex]
2. Divide both sides by 0.005:
[tex]\[ \frac{24.85}{0.005} \leq x \][/tex]
[tex]\[ 4970 \leq x \][/tex]
### Solving for the upper bound:
[tex]\[ 10.15 + 0.005x \leq 55 \][/tex]
1. Subtract 10.15 from both sides:
[tex]\[ 0.005x \leq 55 - 10.15 \][/tex]
[tex]\[ 0.005x \leq 44.85 \][/tex]
2. Divide both sides by 0.005:
[tex]\[ x \leq \frac{44.85}{0.005} \][/tex]
[tex]\[ x \leq 8970 \][/tex]
Combining both results, we get:
[tex]\[ 4970 \leq x \leq 8970 \][/tex]
Thus, the customers use at least 4,970 gallons but no more than 8,970 gallons of water per month.
The best statement that describes this is:
A. These customers use at least 4,970 gallons but no more than 8,970 gallons of water per month.
[tex]\[ 35 \leq 10.15 + 0.005x \leq 55 \][/tex]
First, let's isolate [tex]\( x \)[/tex] in the inequality by solving for [tex]\( x \)[/tex] in both the lower and upper bounds.
### Solving for the lower bound:
[tex]\[ 35 \leq 10.15 + 0.005x \][/tex]
1. Subtract 10.15 from both sides:
[tex]\[ 35 - 10.15 \leq 0.005x \][/tex]
[tex]\[ 24.85 \leq 0.005x \][/tex]
2. Divide both sides by 0.005:
[tex]\[ \frac{24.85}{0.005} \leq x \][/tex]
[tex]\[ 4970 \leq x \][/tex]
### Solving for the upper bound:
[tex]\[ 10.15 + 0.005x \leq 55 \][/tex]
1. Subtract 10.15 from both sides:
[tex]\[ 0.005x \leq 55 - 10.15 \][/tex]
[tex]\[ 0.005x \leq 44.85 \][/tex]
2. Divide both sides by 0.005:
[tex]\[ x \leq \frac{44.85}{0.005} \][/tex]
[tex]\[ x \leq 8970 \][/tex]
Combining both results, we get:
[tex]\[ 4970 \leq x \leq 8970 \][/tex]
Thus, the customers use at least 4,970 gallons but no more than 8,970 gallons of water per month.
The best statement that describes this is:
A. These customers use at least 4,970 gallons but no more than 8,970 gallons of water per month.
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