I don't understand this question that well, can you please help me.

Students taking a make-up test receive the following grades: 76, 90, 97, 96, 86, 95, 94, 69, 71, and 75. Which grade has a percentile rank of 80?

The test score with a percentile rank of 80 is _.

So a percentile rank of a score is how the score of a individual test taker compares to the scores of the other test takers.

To find percentile rank you need to use this formula:  R = P/100 x (N + 1)

The first step is to compute the rank (R) of the 25th percentile. This is done using the following formula: R = P/100 x (N + 1) where P is the desired percentile (25 in this case) and N is the number of numbers (8 in this case).

I hope this helps a bit. Good luck with the problem!

2x^2+5x+17

your welcome. : )

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.