A= 3400t + 600 | given formula
21000= 3400t + 600 | substitute the altitude into the formula
20400 = 3400 | subtract 600 from both sides
6 = t | divide both sides by 3400
6 minutes
Answer:
b. 8 is the correct answet it's clearly
2.1 x 82 =
172.2
I hope this answer was helpful! :)