There are 8 pencils in a package. how many packages will be needed for 28 children if each child gets 4 pencils? use bar model to find answer

Solve for x i'll try to attach the files bc it's not letting me for some reason

∠1 and ∠2 are complementary. ∠1=x°∠2=(3x+30)° select from the drop down menu to correctly answer the question. what is the value of x? . a.15 b.25 c.30 d.40 e.55

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a