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:
-3 ,-4
Step-by-step explanation:
Triangle A is an Isosceles
Triangle B is Equilateral
Triangle C is Scalene
So the first integer is 61.
Then the others must be 62, 63, and 64. To check, you can add them all together. 61+62+63+64=250.