Answer:
x = 16
Step-by-step explanation:
In a parallelogram , consecutive angles sum to 180° , then
3x + 5 + 9x - 17 = 180
12x - 12 = 180 ( add 12 to both sides )
12x = 192 ( divide both sides by 12 )
take off the parentheses and then take off the number and the degrees symbol with the plus sign
take off the parentheses from the 9,-,17, and the degrees symbol
now your left with 2 x'
do x-x = what?
it it x
period
