F(3), replace r with 3
f(3)=3.14(3)^2=3.14(9)=28.26
f(3)=28.26
Answer:
The answer is D
Step-by-step explanation:
Answer:
C.
Step-by-step explanation:
So there are 20 kids with brown hair and this represents 80% of the class total.
So this means 20=.8n since we don't know the total number of kids.
20=.8n
Divide both sides by .8
25=n
So 25 is the total number of kids.
C. is the answer
You could also setup this equation given that 80% is 80/100:
[tex]\frac{20}{\text{ total }}=\frac{80}{100}
To figure out what that total is there you can divide top and bottom of the fraction on right hand side by 4 which gives you the 20 on top and the 25 on bottom.
Each side would be = square root of 64 which is 8m
Perimeter = 8 * 4 = 32 m.
