17 Kelly's dad compares her running times in a marathon to her times for last year's race. He records whether she has increased or decreased her
time for the first three stages of the race. What is the total increase or
decrease in Kelly's time? Did she improve her time? Explain.
Kelly's Marathon Times
Time Comparison
Stage
(in minutes)
First
Second
->
Third
-3
Show your work.

up

step-by-step explanation:

the orientation of the parabolas can easily be found by analysing the power of x and y and their signs. if x is squared , parabola opens up and also if its coefficient is negative it opens down. if y is squared , the parabola opens right and also if its coefficient is negative it opens left. however in order to do the above analysis our equation must be in standard form .

our parabola is

which is not standard form of any parabola . hence we square on both hand side and convert it into standard form.

hence we see that x is squared and its coefficient is non negative . there for it opens up.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

i think the answer is b

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative