Find the value of x in the parallelogram.

75

Step-by-step explanation:

Since the two angles are on the same side of the parallelogram, they're supplementary.

x + (2x - 45) = 180

3x - 45 = 180

3x = 225

x = 75

30

Step-by-step explanation:

First you want to turn 30% into a decimal by moving the decimal point turning it into 0.30

Multiply 0.30 by 42.99 to find 30% of 42.99 which is 12.897

Subtract 12.897 from 42.99 to find the answer which is 30.093 and you can round to 30.