1 radian 
because s= r × angle measurement in radian
we have s= arc , r = radian so we got the value
        
             
        
        
        
We have that
the Volume of cone=(1/3)*B*h
B=the area of the base
h= the height of the cone
D=3.5 in-----------------> r=D/2=1.75 in
h=5 in
B=pi*r²---------> 3.14*1.75²=9.616 in²
V=(1/3)*9.616*5=48.08 in³--------> 48 in³
the answer is 48 in³
        
                    
             
        
        
        
<u>ANSWER</u>

<u>EXPLANATION</u>
Given 
and

We want to find 

This means we substitute the function  in to another function
 in to another function  and evaluate.
 and evaluate.
This implies that;

We expand the parenthesis to obtain;

We simplify further to obtain;

Hence the correct answer is A
 
        
                    
             
        
        
        
Step-by-step explanation:
-7(-3r+2)=3r-6
Distribute the - 7
21r-14=3r-6
Add 14
21r=3r+8
Subtract 3r
18r=8
Divide 18r by 8
2.25 should be the answer to r.