84 what is the slope of a line joining (10,6) and (30,10) a. -5 b. -1/5 c. 1/5 d. 5

C. 1/5

Step-by-step explanation:

slope = (y2-y1)/(x2-x1)

slope = (10-6)/(30-10)

        = (4)/20

      = 1/5

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.