10
make a triangle after the first square and a square after the second printed triangle, then a triangle after that and after the last printed square a triangle
11
3, 4, 3, 3, 4
12
repeating
        
             
        
        
        
Answer:
for no 7 its none for 8 its st 
Step-by-step explanation:
 I hope this helps 
 
        
             
        
        
        
Answer:
try using desmos it is a calculater
Step-by-step explanation:
 
        
             
        
        
        
To find the expected value of the distribution, we multiply each outcome by it's probability. Doing this, we get that the expected value of defects on a skateboard is of  .
.
Outcomes and probabilities:
0 defects, 9/10 probability
1 defect, 1/20 probability
2 defects, 1/25 probability
3 defects, 1/100 probability.
Expected value:

Dividing both numerator and denominator by 4:

Thus, the expected value of defects on a skateboard is of  .
.
A similar problem is given at: brainly.com/question/23156292.