Answer:
The 1st error that Carlos made was in Step 2...
In step 2 , Carlos multiplied 14 only with 40. If he would have multiplied 14 with both 40 & 9 , then it could have been alright.....
 
        
             
        
        
        
I hope this helps you 
Pythagorean 
hypothenus ^2=base^2+height ^2
hypothenus ^2=15^2+20^2
hypothenus ^2=225+400
hypothenus ^2=625
hypothenus ^2=25
        
             
        
        
        
Answer:
4845 ways
Step-by-step explanation:
To solve this problem we use the formula of combinations

Where n is the total number of students that can be chosen and you choose r from them.
So

Note that in this case the order in which the 4 students are chosen does not matter.
Then


 
        
                    
             
        
        
        
Answer:
a- (3,4)
b- (0,-4)
c- (-6,2)
d- (0,5)
e- (-4,-5)
Step-by-step explanation:
hope this helps