Answer:
a and b.
Step-by-step explanation:
I’ll explain by giving an example.
Let’s say that: a=3;b=4;c=5; => they all are consecutive -> their sum is 12.
=> if we use a) n=3 => 3*n+3=3*3+3=12 => correct.
b) n+(n+1)+(n+2)= 3+4+5=12=> correct.
c)n+2n+3n=3+6+9=18=>incorrect.
d)3n=3*3=9=>incorrect.
20/110 because there's 20 kids in her third period but 110 overall hope I helped in time
Okay I’ll solve this but it’ll take a while to answer but I’ll try my best to finish as fast as I can!
Answer:
Step-by-step explanation:
2x-xy=3
-xy=3-2x
y=3-2x/x
