ktene993

24.06.2019 • 

Mathematics

Two test preparation companies claim that students are guaranteed to score between 85% and 100% on a test of math skills after using their materials. a researcher decides to evaluate the claims by randomly selecting two groups of 25 students and giving each group a different set of materials. the line plots show the results. based on these samples, which statement is true about the materials from the two companies? the mean scores for the two groups are the same, but the range is different. the mean scores for the two groups are different, but the range is the same. the mean score and the range of scores for the two groups are about the same. the mean scores and the range of scores for the two groups are different.

Ответ:

NateTheBeast12

21.10.2022

Mathematics

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Answers:

x = 51

y = 39

Explanation:

The angles 39 and x form a right angle, aka 90 degree angle. This is shown by the small square angle marker.

One equation to solve is x+39 = 90. Doing so leads to x = 51 after subtracting 39 from both sides.

Similarly, another equation to solve is x+y = 90. Plug in x = 51 and isolate y

x+y = 90

51+y = 90

y = 90-51

y = 39

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