Two orders are placed at a T-shirt design store. In the first order, three long-sleeved shirts and four short-sleeved shirts cost $95. In the second order, four long-sleeved shirts and seven short-sleeved shirts cost $145. Which system of linear equations below can be used to determine the price of each type of shirt? Let x represent the cost of a long-sleeved shirt, and let y represent the cost of a short-sleeved shirt.
A.
3x + 4y = 95
4x + 7y = 145

B.
7x + 11y = 240

C.
3x + 4y = 145
4x + 7y = 95

D.
2x + 4y = 86
5x + 7y = 142

Od. 130 degrees because if you add them together you get the 130

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

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