Help me to answer this Math pls

a) 1) equilateral (all equal sides)
2) isosceles (equal opp. sides)
3) scalene (unequal sides)

b) 1) obtuse (> 90°)
2) acute (< 90°)
3) right (90°)

c) 1) Equilateral & equiangular (< 90° & equal sides)
2) Right scalene (90° & diff sides)
3) Acute isosceles (< 90° & 2 equal opp. sides)

Hope it helps ⚜

B. because the 7 represents "seven times", x represents "a number", 12 represents "plus twelve", and -4 represents "minus four"