Since the shape is a parallelogram, the length of the last ide is 6 feet.
If

is the variable of the horizontal axis, then you can solve for

to get the equation of the line in slope-intercept form in the

plane:

i.e. a line with slope

through the origin, which means it is contained in the first and third quadrants. Since the terminal side of

has a negative sine, the angle must lie in the third quadrant.
Because the slope of the line is

, you can choose any length along the line to make up the hypotenuse of a right triangle with reference angle

. Any such right triangle will have

, regardless of whether the angle is the first or third quadrant. But since

is known to lie in the third quadrant, and so

and

are both negative, you have
A = 30 degrees or pi/6 radian
o = 60 degrees or pi/3 radian
Sorry man, it’s a tough time for figure out
Use this paper and examine the steps. This will help you understand the trigs formula to solve for each.
a)0.43^5*0.57^5
b)0.43^6*0.57^4
c)0.43^3*0.57^7+0.43^2*0.57^8+0.43^1*0.57^9+0.57^10