Help please if you can :)

Which expressions are equivalent to -6 + 3m

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2

Me with these questions , i don’t understand scientific notation!