First you need to divide the area by pi. Then take that answer and square-root it. Your answer should come out to about 3.2 is the radius.
        
             
        
        
        
Step-by-step explanation:
<u>Break down the word expression:</u>
The sum of 5 and b divided by two
 the sum (+) of 5 and b (5 + b) divided by 2.
<u>Expression:</u>

Parentheses represent that we need to add first, in order to divide the sum by 2.
 
        
             
        
        
        
Answer:
After one unit is sold, Becky will break-even.
Step-by-step explanation:
Giving the following information: 
Fixed costs= $1
Unitary variable cost= $21
Selling price= $22
<u>The break-even point is the number of units required to cover the fixed costs after deducting from the selling price the variable components. At this point, net income is zero</u>.
Break-even point in units= fixed costs/ contribution margin per unit
Break-even point in units= 1 / (22 - 21)
Break-even point in units= 1
After one unit is sold, Becky will break-even.
 
        
             
        
        
        
its C 
Step-by-step explanation:
- 2\sqrt5
this is the tan©
but you have to multiply by sqrt 5 
so its become -2sqrt5/5