Bills number is 4 more than mary's. the average of their numbers is 36. what is each persons number?

Mary=34

Bill=38

Step-by-step explanation:

bill's number=b

mary's number=m

(m+b)/2=36

b=m+4

(m+m+4)/2=36

(2m+4)/2=36

m+2=36

m=34

b=34+4=38

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.

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8