Answer:
43 questions in total
Step-by-step explanation:
the original equation with the unknown (total number of questions on the test) will look like this

we know this because to work out a percentage in the 1st place you need the total ÷ number (in this case it's ÷ how many questions out of the total she did answer)
now you rearrange.
you need to move the 24 to get the total on it's own here's how you do it 

what you do to one side of equation you have to do to the other. the 24 and 24 on the left will cancel because 24÷24=1 and we don't write 
got mum of Q's x 1= 80 x 24
now you convert % to decimal

replace

now you take the original and + the 19

therefore there are a total of 43 questions on the exam
 
        
             
        
        
        
Answer:
y=-3
Step-by-step explanation:
slope is 0 so we know it is a straight line.
your y value is -3 so therefor is your answer 
 
        
             
        
        
        
Here is my answer, hope to help you
        
             
        
        
        
Which number means four hundred seven and six hundred fifty-two thousandths?
answer is
407.652
        
             
        
        
        
Answer:
95% Confidence interval:  (111.02,112.98)
Step-by-step explanation:
Average = 112 seconds
Standard Deviation = 9 seconds
n = 324
Confidence interval:
 
Putting the values, we get,
 
