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Calculating Average Rates Of Change Answers

I currently have 733/1100 points in my Chem class. (NOTE THIS DOESN'T INCLUDE FINAL) (76.7% according to teacher's gradebook) Here's his grading system: 90%= A 75%=B...

On Monday,my math class learned how to find the percent of change, and I was absent on Monday. And we did some problems in class today, and I still don't understand it. Can you help me to understand/explain...

scott began printing his history paper at 3:15. at 3:20,he found that it had printed 12 of his 15 pages.

the concession stand at the amusement park begins the day with 500 popcorn containers. when the park closes, 12 hours later,an inventory shows there are only 44 containers left.

when an amusement park opened,the counter on the turnstile at the entrance read 1278. 7 hours later,the counter read 3672.

when an amusement park opened,the counter on the turnstile at the entrance read 1278. 7 hours later,the counter read 3672.

at 1:00 the temperature outside registered 85 degrees.at 7:00, the temperature was 61 degrees.

dara works in the clothing department of a large store. when she began her shift at 4p.m.,the register showed sales of \$10,550. when she clocked out at 9p.m.,the register showed sales of \$40,620.

dixie left austin with a full tank of gas(16 gallons) and an odometer reading of 12,584 miles. upon arriving in houston, her gas tank was only half full(8 gallons) and her odometer reading was 12,792...

on his 5th birthday,paul was 42 inches tall. on his 7th birthday,he was 48 inches tall.

mr.suarez joined a gym to lose weight.after 3 weeks of membership he weighed 189 pounds. when he had been a member for 12 weeks,he weighed only 162 pounds.

a lab technician is growing a bacteria sample. after 1 hour,she notesthat there are 250 bacteria in the sample. after 3 hours,she notes that there are 1000 bacteria in the sample.

the value of my new car after 2 years was \$11,200. when the car is 6 years old,the value has dropped to \$6100.