Step-by-step explanation:

Let x + 15 = total penguins
15/ (x +15) = .30
15 = .30x + 4.5
.30x = 10.5
x = 35
Total penguins = 15 + 35 = 50
Double Check
15 / 50 * 100 = 30% Correct!!!
Answer:

Step-by-step explanation:
becauseby pytagorean theorem we get

16+81=c squared
97 =c squared
c=radical 97
See attached picture with the answer
Answer:
(or 6)
Step-by-step explanation:
<u>Set f(x)=0:</u>




or 
<u>Now check both solutions:</u>




Therefore,
because there is a hole at
. The denominator, in addition, can never be 0, so the function is undefined for
.





Since
, then
is the only zero of the function.