The ratio of red collars to black collars sold at one store is 9 to 10. in one month 30 black collars are sold. is 57 a reasonable number for the total number of red and black collars sold that month? explain your reasoning.

Yes because if the ratio is 9:10, then the new ratio would be ?:30. Since 10 was multiplied by 3, 9 should also be multiplied by 3, which equals 27. 30+27=57 so yes it is a reasonable number for the total

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