Two vectors beginning at the same vertex of a triangle are 〈2,1〉 and 〈1,-7〉. Choose the correct classification of the triangle. Acute
Obtuse
Right
Equilateral

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Two language majors, anna and megan, took exams in two languages. anna scored 85 on both exams. megan scored 74 on the first exam and 85 on the second exam. overall, student scores on the first exam had a mean of 82 and a standard deviation of 4, and the second exam scores had a mean of 71 and a standard deviation of 13. a) to qualify for language honors, a major must maintain at least an 85 average across all language courses taken. so far, which of anna and megan qualify? b) which student's overall performance was better?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15