143 is the answer.
Step-by-step explanation:
The line that has the 1, and the 37° is a total of 180°.
To find the value of 1, simply subtract 37° from 180°:

<1 = 143
Answer:
its a parallelogram because it has four sides that are parallel to the opposite side of each other
Do u want the first or second derivative
df/dx= 10-2y, df/dy= -2y+14,
then second deriv is df/dxdy=-2
df/dydx=0