James works as a waiter. he served meals with bills of 23.59, 40.65, 30.50, and 15.68. if his total for tips was 17.67, what percent tip did he receive for serving these meals? round the answer to the nearest percent

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Reflect the point (7,0) across the y-axis