Answer:
11x -21= 180
11x=201
18.2727273
Step-by-step explanation:
There were 18 girls because 27 divided by 3 is 9 so then you do 2 times 9 which is 18 :)
Answer:
Step-by-step explanation:
Answer:
4:
a.) 49x^2-36y^2
b.) 9a^2-25b^2
c.) 1/25x^2-49
5: b.) -5x^2-4xy+4y^2
Step-by-step explanation: