(3x – 15)º (y + 25)º
105°
Find the value of y.
y=50
y = 80
y = 70
y = 25

y = 50.

Step-by-step explanation:

The line that its on is 180 degrees. So you know from the angle below that the one with x in it is 105 degrees. 180-105 = 75 degrees.

Once you have that you just do the math.

y + 25 = 75

y = 50

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.