Area of a circle = pi • r^2
We need to isolate for r.
A/pi = r^2
r = sqrt(A/pi)
r = sqrt(30.8/pi)
r = 3.1311251164
Diameter = 2r
Diameter = 6.26225023
Diameter = 6.3 m
Answer:a/b x c/d= a x c/b x d
Show that ac and bd are integers
Step-by-step explanation:
Answer:
C. 
Step-by-step explanation:
To find slope using coordinates, use the formula above.
Now, using the 
formula, plug in 
as 
(slope) and either coordinate as the 
and 
values. It looks like this:
To solve for 
, continue to use PEMDAS.
Now use and to solve for your equation:
The answer is C.
Answer:
Step-by-step explanation:
surface area=area of sides +area of top and bottom
=2(4+5)×8+2×(4×5)
=2[(9×8)+20]
=2[72+20]
=2×92
=184 m²
So we solve for each
70% of 100=70
students who didn't buy lunch=100-70=30
some of the 70 left so that the students who bought lunch, are 60% of those who are left
we know that the students who didn't buy lunch didn't change number so therefor
100% of students left-60%=40%= students that didn't buy lunch=30 so
40%=30
20%=15
100%=75
there were 75 students lfet in the cafeteria
