Consider the conversion facts 1 inch = 2.54 centimeters and 1 centimeter ≈ 0.39 inch. a. Write an expression for the exact number of inches in 1 centimeter.

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Question 2
b. Use a calculator to evaluate your expression in part (a). Round to the nearest ten thousandths if necessary.

1 cm ≈
in.

Question 3
Explain why measurement conversions may be slightly different when converting between metric units and U. S. customary units using the conversion facts in the back of the book.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle