There is 4.88% decrease in Olivia's score.
Step-by-step explanation:
Given, 
Score on first math test = Old value = 82 points 
Score on second math test = New value = 78 points 
Change = New value - Old value 
Change = 78 - 82 = -4 
The negative sign indicates the decrease.
Decrease percent = 
Decrease percent = 
Decrease percent = 4.88% 
There is 4.88% decrease in Olivia's score.
Keywords: percentage, difference
Learn more about percentage at:
#LearnwithBrainly
 
        
             
        
        
        
Step-by-step explanation:
Let's say the two digit number is 10x + y, where x is the first digit and y is the second digit.
The sum of the digits is 8:
x + y = 8
If 8 is subtracted from the number, the digits switch place.
10x + y − 8 = 10y + x
Simplify the second equation:
9x − 8 = 9y
Substitute from the first equation.
y = 8 − x
9x − 8 = 9 (8 − x)
9x − 8 = 72 − 9x
18x = 80
x = 4.444
There's a problem.  x isn't an integer.  Are you sure you copied the problem correctly?  Perhaps you meant if 18 is subtracted from the number, the digits switch place.
9x − 18 = 9 (8 − x)
9x − 18 = 72 − 9x
18x = 90
x = 5
y = 8 − x
y = 3
So the number is 53.
 
        
                    
             
        
        
        
Answer: The clubs goal is to raise  $436. 
Step-by-step explanation:
175%  * x  = 763     where x is the goal  
1.75 *x  = 763 
1.75x = 763 
x= 436