I know u gonna use calculator girl.
21 rounded to the nearest 10 is 20 :)
Volume =
multiply r by 2 and you will get diameter
Answer: 51.75$
Step-by-step explanation: First, turn 15% into the decimal 0.15, then multiply by 45, which equals 6.75. Now add 6.75, which is the amount the waitress got tipped to 45, which equals 51.75$ total.