A triangle has side lengths of 23 in, 6 in, and 28 in. classify it as acute right or obtuse

In this case, the side lenghths don't even form a triangle. Since that is not an option, the triangle would be acute.

Step-by-step explanation:  

if c^(2 )> a^(2)+b^(2) then the triangle is obtuse.

if c^(2 )< a^(2)+b^(2) then the triangle is acute.

if c^(2 )= a^(2)+b^(2) then the triangle is right

Hope this helps :)

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.