Answer:
-4 to 3
Step-by-step explanation:
look at the first number in each set then find the smallest and the biggest that is how you find range
 
        
             
        
        
        
If x is how long your friend swims and y is how long you swim, the answer would be x + 15 = y
        
             
        
        
        
<h3>
Answer:    Choice D)  3.7 * 10^6</h3>
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Explanation:
Place a decimal point between the first two digits 3 and 7. 
Now ask yourself how you can go from 3.7 back to the original value. Notice we can move the decimal point 6 spots to the right to go from 3.7 back to 3,700,000
Therefore, the exponent over the 10 is 6. The exponent is positive to mean we move the decimal point to the right. If we had a negative exponent, then we'd move left. 
You can use a calculator to confirm that 3.7 * 10^6 = 3,700,000
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Side notes:
3,700,000 = 3 million, 7 hundred thousand
3,700,000 = 3.7 million