The subtraction sign in front of the second set of parenthesis changes the signs on the terms inside those parenthesis. So this could be rewritten as 
. None of the exponents on the x are the same, so we will just express it in terms of descending powers of x. 
. This is also the same as 
if you don't like to start with a negative. Either one is correct.
A swimmer swam the 50-meter freestyle in a time of 21 seconds. What was the speed to the nearest tenth of a meter per second?
2 answers:
Answer:
2.4 meter per second
Step-by-step explanation:
A swimmer swam the 50-meter freestyle in a time of 21 seconds.
Since a swimmer swam in 21 seconds = 50 meters
To calculate his speed in 1 second we will divide the total distance by the total time.
Therefore, he swam in 1 second =
= 2.380952 rounded to 2.4 meter/sec
The speed of the swimmer is 2.4 meter per second.
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