18 girls
Half of the students volunteer
15 don't -- so the other half must be 15 as well making there 30 students in the class.
If 12 are boys, then 30(students in class) - 12 (boys) = 18 girls
Answer:
Yes, because
is equivalent to 
Step-by-step explanation:
and 

Hope this helps!
Answer:
y = -5/4x + 7 1/4
Step-by-step explanation:
The difference in y (10) over the difference in x (8)
Hi!
We know that there are three measures and each has a different amount of notes. To find the total we add them all up.
8+16+4=28.
There were 28 total notes played in the song.
I hope I helped you!
Have a wonderful day!