Answer:

Step-by-step explanation:
Given
AB = 48, AC = 64, and BC = 80
Required
Determine the ratio of cosB
The first step is to determine, which type of triangle it is.
Checking for Right Angled Triangle
For a triangle to be a right angled triangle, the square of the largest side must be equal to the sum of squares of other sides
This implies that:



<em>Hence, the triangle is a right angled triangle [See attachment]</em>
From trigonometry;

The adjacent of B = 48 while the hypotenuse is 80;
Hence;

Hence, the ratio of cos B is 
Answer:
16 +7= 23
Step-by-step explanation:
it's a addition problem
For this case we have by definition, that the equation of a line in the slope-intersection form is given by:

Where:
m: It's the slope
b: It is the cutoff point with the y axis
We need two points through which the line passes to find the slope:

We found the slope:

So, the equation is of the form:

We substitute a point to find "b":

Finally, the equation is:

Answer:
Option C