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2. irrational, the decimal is repeating

3. 11 42/99

4. 15/2 , 8 1/7 , 8.14 ,

5. because it is the only repeating decimal of the four numbers

Step-by-step explanation:

im not 100% sure about the last two but that what i think

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.