What is the missing value of x if there is a triangle with the sides 6x, 3x+12, and x + 25 and the angles of 70 degrees and 40 degrees (the third angle is not there)

We can use the law of sines, which relates the angles and sides of a triangle.
The formula is:
,
where A, B, and C are angles and a, b, c are side lengths.

Let's find the missing angle. The interior angles of a triangle add up to 180 degrees, so the missing angle is 180-70-40 = 70 degrees.

Let's make a proportion and use the two 70 degrees angles and their opposite lengths. Since both sides have the same numerator of 70 degrees, we can equate the denominators together.

The answer to the question is d