Hi hi!!
So, A is correct because it is the same equation just (3+4) is in the front. D is also correct because it is the same question because when a number is for example like 10(3+4) it mean multiplication and in this case you are multiplying. B and C are incorrect because they do not have a total of 70. The original equation, 10x(3+4) = 10x7 = 70. 
Correct answers:
A. (3+4)x10
D. 10(4+3) 
        
             
        
        
        
Answer:
add 17.50 to 8.75 you get 26.25
 
        
                    
             
        
        
        
The answer is 4/5 because if you multiply the top and bottom by 4 you get 16/20
        
             
        
        
        
Answer:
c) 
Step-by-step explanation:
 Equation for regression line of y on x is given as

where 
 = predicted value
 = predicted value
m = slope of line
b = intercept
m and b are found as

r = correlation coefficient = 0.88
Sx = standard deviation for independent variable x = 13
Sy = standard deviation for dependent variable y = 27
 = mean value of independent variable x = 21
 = mean value of independent variable x = 21
 = mean value of dependent variable y = 55
 = mean value of dependent variable y = 55
Substituting these values in (2) and (3)


Putting these values of m and b in (1)
