Attached is the image of the concerned ECG reading.
In reading the ECG, first you read the heart rate. To read the heart rate, you must count for the number of small boxes in between QRS complexes, specifically R-R intervals. These number of small boxes will then be used to divide 1500. In this example, there are 20 small boxes between R-R intervals. 1500 divided by 20 is 75, so the heart rate of this ECG reading is 75 beats per minute. 
<em>Another way, albeit less accurate, is to count the big squares between R-R intervals and instead of dividing it by 1500, you divide it by 300.</em>
 
        
        
        
Answer:
quiz on what.so tht i can partake
 
        
             
        
        
        
<span>The Answer is B: They could use the Benedict's test; it would not have a positive reaction for sucrose but it would for the other three sugars.</span>
        
                    
             
        
        
        
a) volume in cm³ = 20 × 42 × 42 = 35280 cm³
b) volume in m³ = 0.2 × 0.42 × 0.42 = 0.03528 m³
c) volume in ml³ = 200 × 420 × 420 = 35280000 ml³
d) volume in litres = 0.02 × 0.042 × 0.042 = 0.00003528 l³
e) Density = Mass / Volume 
Mass = Volume × density 
 = 0.00003528 × 1 
 = 0.00003528 × 1000 
 = 0.03528 grams 
f) Mass in kilo gram = 0.00003528 kg