What is 1 + 2 = a3 b4 c5 d5678889990087766

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

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

What is the explicit rule for the sequence in simplified form? −1,−4,−7,−10,−13… an=4−5n an=−4−3n an=2−3n an=−6−5n