9.1.7 Compute the critical value Za/2 that corresponds to a 85% level of confidence
Click here to view the standard normal distribution table (page 1).
Click here to view the standard normal distribution table (page 2).
Za/2=
(Round to two decimal places as needed.)

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.

answer for #1 is c

answer for #2 is d

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