This is math and what is this answer me what is (-21)+(-9)

What is another way to express 36 +32

How many terms does the polynomial x^2 y^2 have

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by