Step-by-step explanation:
12. Cos 60° = 8/c
 0,5 = 8/c
 0,5 c = 8
 c = 16
 D² = V16²-8²
 = V256-64
 =V192 = V16×12 = 4V12 
 = 4V4×3 = 8V3
13. Cos 30° = 6/b
 V3/2 = 6/b
 V3 b = 12
 b = 12/V3
 b/Sin B = a /sin A
 b/Sin90° = 6/ sin 60°
 <u>b</u> = <u> </u><u> </u><u> </u><u>6</u><u> </u><u> </u><u> </u>
 1 V3/2
 b× <u>V3</u> = 6
 2
 b = 6× 2/V3
 = 12/V3
 
        
             
        
        
        
Answer:
−x^3−4x^2+2x+7
Step-by-step explanation:
 
        
             
        
        
        
Mean means average. 
To find the average, add the data then divide it by the amount of individual data you have. 
(6.5 + 5 + 3 + 2 + 2 + 3.5 + 5)/2 = mean
27/2 = mean
13.5 = mean
13.5 miles is the mean distance that Jim jogged. 
 
        
             
        
        
        
The number of units produced by the worker during t hours of work can be modelled by the following function:

To find the number of units produced during first 3 hours, we can substitute 3 for t. This will give us the number of units produced by the worker during first 3 hours.

Thus the worker will produce 67 units during the first 3 hours of the work.