12/10 + 9/10 = 21/10
21/10 simplified is 2 1/10
A 90º degree angle is a right angle. Anything below is an acute angle and anything more than 90º is an obtuse angle.
Answer:
a&c
Step-by-step explanation:
because you can multiply to numbers and reach 0 or 2, but no number times another equals 7 and no number times 0 equals three (multiplicative identity of 0)
