Areading list for a course contains 20 articles. how many ways are there to choose three articles from this list? place your answer in the blank. do not use any decimal places or commas. for example, 45 would be a legitimate entry.

An isosceles triangle has two sides of equal length, a, and a base, b. the perimeter of the triangle is 15.7 inches, so the equation to solve is 2a + b = 15.7. if we recall that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side, which lengths make sense for possible values of b? select two options. –2 in. 0 in. 0.5 in. 2 in. 7.9 in.