If there are eight students total, and five are boys, then the fraction would be 5/8.
5 students out of eight, are boys.
2 graph I think not certain
Answer:
f(x)=x^2+3
f(x+y)=(x+y)^2+3
this is done by replacing x with (x+y)
f(x+y)=x^2+2xy+y^2+3
therefore : f(x+y)= x^2+y^2+2xy+3
