Ineed desperate , check your work for accuracy.

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?