Answer:
21
Step-by-step explanation:
49 - 4 x 49 / 7 =
49 - 196 / 7 =
49 - 28 =
21
<em>Hope that helps!</em>
Answer: 7
(I just took the test and it's correct) Hope this helps!
ok so the obtuse angle is always across from the acute angle so the answer is b

Actually Welcome to the concept of Radioactive decay.
N(t) = 72(1/2)^22/11
==> N(t) = 72 (1/2)^2
==> N(t) = 72/4
==> N(t) = 18 grams.
So the remaining would be 18 grams.