Example

Water used (in thousands of gallons)	Cost
$0\leq x\leq 10$	$\$9.00$
$10 \lt x\leq 30$	$9.00+0.95 for each thousand gallons in excess of 10,000 gallons
$30 \lt x\leq 100$	$28.00+1.65 for each thousand gallons in excess of 30,000 gallons
$x>100$	$\$143.50+2.20$ for each thousand gallons in excess of 100,000 gallons

Water used (in thousands of gallons)	Cost
\(0\leq x\leq 10\)	\(\$9.00\)
\(10 \lt x\leq 30\)	$9.00+0.95 for each thousand gallons in excess of 10,000 gallons
\(30 \lt x\leq 100\)	$28.00+1.65 for each thousand gallons in excess of 30,000 gallons
\(x>100\)	\(\$143.50+2.20\) for each thousand gallons in excess of 100,000 gallons