Answer:
Step-by-step explanation:
Her average speed for the first lap is 8m per second. Her speed for the second lap is about 7.6m per second. So her total time for the two laps is 1 minute and 42 seconds.
Answer:
The variance is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 21
The sum of squares is 
Generally the variance is mathematically represented as

substituting values


Question, do you need the angles? If it’s the angles use a protractor and measure.
Answer:
This means that, when the price of a book from a publisher is $60, the bookstore will sell it for $88 to the students.