Use similar triangles (see the picture I drew at the bottom)
I believe that they typo meant 300 fossils of which 21% are snail shells.
Since % means per one hundred...
300(21/100)=63
Elmer has 63 fossilized snail shells.
Answer: y=2(x-3)-5
I hope this is good enough:
Answer:
$12 per hour
Step-by-step explanation:
4320 / 9 = 480 per week / 40 = 12 per hour