Answer:
B
Step-by-step explanation:
4x + 6y = 28
-15x - 6y = -39
Answer: 5/6
Step-by-step explanation: trust me on this
27 is B. 11.2 and I think 28 is A. scalene
25 a² + 20 ab + 4 b²
for formula

find u,v such that: u.v = a
and u+v = b then group according to

=

factor out 5a from :

factor out 2b from :

=

factor out :

=

Refine:

hope this helps!.
Answer:
620
Step-by-step explanation:
9.87 is about 10 and 0.509 is about 0.5
(31 * 10) / 0.5 = about 620