How did the 5 become 15/4... kinda confuse can anybody help?

take 3/2 - 1/4 over to the right side of the equal sign( and then the signs change; the '+' & '-' )

then 1/2x + 3/2x =2x

and 5 -3/2 + 1/4 = 15/4

to get x alone you divide both sides by 2.

i hope this helps

xxx

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°