Answer:
<em>After </em><em>47</em><em> days she will have more than 90 trillion pennies.</em>
Step-by-step explanation:
At the beginning there was 1 penny. At the second day the amount of pennies under the pillow became 2.
The amount of pennies doubled each day. So the series is,

This series is in geometric progression. 
As the pennies from each of the previous days are not being stored away until more pennies magically appear so the sum of series will be,

where,
a = initial term = 1,
r = common ratio = 2,
As we have find the number of days that would elapse before she has a total of more than 90 trillion, so









 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
Given
20 - ||  - 13 | + 17 |
Note the absolute value function always returns a positive value, that is
| - a | = | + a | = a, thus
= 20 - | | - 13 |+ 17 |
= 20 - | 13 + 17 |
= 20 - | 30 |
= 20 - 30 
= - 10 → A
 
        
                    
             
        
        
        
When a teacher gives a test with questions that fall into 3 levels of difficulty (easy, moderate, and hard) The scoring method that would best allow her to identify the students who need help is: 
B. weight each question by its difficulty: 1 for easy, 2 for moderate, and 3 for hard.
        
             
        
        
        
1/12 since there is only 2 the probability is 1/12
        
             
        
        
        
If it has a constant slope that means it makes a straight line making it linear