8,4,6,6,7,7,9,4,8,5 find the mean

6.4 is the mean of the set of numbers

Step-by-step explanation:

8+4+6+6+7+7+9+4+8+5=64

64 divided by 10 = 6.4

Hope this helps!

The answer is 6.4, i think-

Step-by-step explanation:

Hope this Helps

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.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9