Positive, 72 minus negative 9 is the same thing as 72+9, which equals 81. So the answer is positive
Answer: y = 0, 5/4
hope this helps
Answer:
9^2= 81, √25= 5, 21^2= 441, √4= 2, √144= 12, 16^2= 256, √625= 25, (-11)^2=121
21/20
Step-by-step explanation:
1) 2a = 9b ⇒ 2:9
2) a + b = 3b ⇒ a = 2b ⇒ 1:2
Answers: 2:9 and 1:2
