Which of the following can be added without altering any of the fractions? a. 3x/x-1 + 8/x-1
b. 6x+1/4x-8 + 1/4x+1
c. 6x/x+6 + 6x/x-6
d. 6x/x-7 + x-7/6x

a

Step-by-step explanation:

+

These fractions have a common denominator and so do not require to be altered.

The numerators can be added to simplify, that is

=

The remaining fractions have different denominators and would require to be altered before they could be added.

could you give more information?

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°