The order of the smallest to largest angle is angle B, then angle A and the largest is angle C. In a theorem of the Triangle Inequalities, the larger value of the distance, the larger the opposing angle is. To get the exact value of each angle, law of cosines can be used.
Answer:

Step-by-step explanation:
To find a line perpendicular to 2x - 5y = 20, we need to find the slope of the line. To get the slope, we can solve for y, and get the equation in the form of y=mx + b
So I will solve for y:

So we know the slope is 2/5
The slope of a perpendicular line is the oposite reciprocal of original line. So the oposite reciprocal of 2/5 is -5/2. That will be our new slope
Now that we know the slope we can use the point slope formula to find an equation, then solve for y.
y-y₁=m(x-x₁)
y-4 = -5/2(x+ 1/2))
y= -5/2x + 11/4
Answer:
I'll only answer the 1st one: 17 cubed / square root of 12
Step-by-step explanation:
Figure the rest out yourself.