Answer:
Option 1
Step-by-step explanation:
Rational numbers do not have infinite decimals.
Option 1:
-5, 3/4 and √49 are all rational. Correct
√49 = 7
3/4 = 0.75
-5 = -5
Option 2:
1/4 = 0.25
5 = 5
√12 = 3.4641...
Incorrect
Option 3:
-1/2 = -0.5
-3 = -3
√8 = 2.82841...
Incorrect
Option 4:
1/7 = 0.142857...
9 = 9
√11  = 3.31662...
Incorrect
 
        
             
        
        
        
If 28 tiles is placed in 7 rows then each row has 4 tiles. 
<u>Step-by-step explanation:</u>
The total number of tiles given =28.
The number of rows = 7.
The number of tiles in each row is given by diving the total number of tiles given by the number of rows.
No of tiles in each row=  .
.
No of tiles in each row =  .
.
No of tiles in each row = 4.
Note: You can replace the values according to the given values.
 
        
             
        
        
        
Answer: $0.58
<u>Step-by-step explanation:</u>
Let x represent pencil and y represent eraser
10x + 7y = 4.23   →   1(10x + 7y = 4.23)   →   10x + 7y =  4.23
 3x  + y  = 0.95   →  -3(3x  + y  = 0.95)   →   <u>-21x - 7y</u> =<u> -6.65 </u>
                                                                     -11x         = -2.42
                                                                   <u>÷-11          </u>   <u>÷-11       </u>
                                                                          x        = 0.22  
       3x + y = 0.95
3(0.22) + y = 0.95
    0.66 + y = 0.95
                y = 0.29
2y = 2(0.29)  = 0.58