Answer:
<h3><em>
D. 880 = 45d + 70; 18 days.</em></h3>
Step-by-step explanation:
We are given fixed monthly charge = $70.
The cost of preschool per day = $45.
Number of days = d.
Total cost of d days = cost per day × number of days + fixed monthly charge.
Therefore, we get equation 
880 = 45×d+70
<h3>880 = 45d +70.</h3>
Now, we need to solve the equation for d.
Subtracting 70 from both sides, we get 
880-70 = 45d +70-70
810=45d
Dividing both sides by 45, we get

18=d.
Therefore,<em> 18 days Barry attended preschool last month.</em>
<em>Therefore, correct option is D option.</em>
<h3><em>
D. 880 = 45d + 70; 18 days.</em></h3>
 
        
             
        
        
        
Answer:
The first term is 42.
Step-by-step explanation:
The common difference is 142  - 140 = 2 so we have
50th term =  a1 + 2(50 -1) = 140    where a1 is the first term
a1 + 98 = 140
a1 = 140 - 98 =  42.
 
        
             
        
        
        
Answer:
13/1700
Step-by-step explanation:
so you do 13/17 x 1/100 which is 13/1700 please mark brainliest
 
        
                    
             
        
        
        
Answer:
I think that her taking the skateboard is 4 times as fast as her walking.
Step-by-step explanation:
I got this because she traveled twice as long and twice as fast on the skateboard, so if you multiply it together, there u have it.