Find the length of each missing side and each missing angle in the equilateral triangles below

z=4.2ft

x=60 º

y=60 º

Step-by-step explanation:

Because the triangle is equilateral, all sides are the same, so z=4.2

Also because it is equilateral, all angles of the triangle equal 60 º.

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.

351°f

step-by-step explanation: