Their performance varies considerable, they are often idle, and then might have an occasional flurry of activity.  For example, if their attendance is sporadic, they may have good attendance for a while, and then disappear unpredictably from time to time.
 
        
                    
             
        
        
        
C it is complex sentences
        
                    
             
        
        
        
Answer:
I have learned that you need to study and do your homework to pass highschool. I also learned that you need to ask for help when needed, if you don't you could face really big problems in school.
Explanation:
 
        
             
        
        
        
“To be” verb is mainly used to indicate and identify this verb tense present and the applying –ing of the present participle of the verb word used in the sentence. <span>The present progressive tense is a verb tense that means the action is continuing or in the act right now.
Example:
She is having an affair.
She wants to be famous.
She likes to have a baby.</span>
        
             
        
        
        
We have to find when she will accumulate $175. If she saves $5 more for each month, then in the following months she will save 15, 20, 25 and so on. We can generalize this sequence as 10 + 5(n-1), where n is the number of the months. Applying the sum of nth formula of algebraic sequence, we can write



The correct answer is 7 months. We can check that for seven months she will save 15, 20, 25, 30, 35, 40 and including the first 10 dollar will sum up to 175 dollars.