Answer:
-48
Step-by-step explanation:
12 x 2=24
12 x 6= 72
24 - 72 = -48
 
        
             
        
        
        
Step-by-step explanation:
tanB + cotB = (sinB)/(cosB) + (cosB)/(sinB)
 
                      = (sin2B + cos2B)/[(cosB)(sinB)]
 
                       = 1/[(cosB)(sinB)]
 
                        = (1/cosB)(1/sinB)
 
                        = (secB)(cscB)
 
        
             
        
        
        
Answer:
42 degrees
Step-by-step explanation:
48 and r are equal. 
The box means right angle, or 90 degrees
180-90-48=42 degrees
 
        
                    
             
        
        
        
Answer:
% Po lost = 100[1 - e^(-0.005t)]  %; 73.0 g
Step-by-step explanation:
p(t) = 100e^(-0.005t)
Initial amount:        p(0) = 100
Amount remaining: p(t) = 100e^(-0.005t)
Amount lost: p(0) – p(t) = 100 - 100e^(-0.005t) = 100[1 - e^(-0.005t)]
% of Po lost  = amount lost/initial amount × 100 %
= [1 - e^(-0.005t)]  × 100 % = 100[1 - e^(-0.005t)]  %
p(63) = 100e^(-0.005 × 63) = 100e^(-0.315) = 100 × 0.730 = 73 g
The mass of polonium remaining after 63 days is 73 g.