Answer:
x=4
Step-by-step explanation:
12x-48 12*(4)
12=0
x=4=0
Add 4 to both sides of the equation
So x=4
12*4+25
48+25
73
Distribute
4x+4(less than) -6
Subtract 4 on both side
4x(less than) -10
divide 4 both sides
x(less than)-2.5
(Final answer is bold) Good luck
Answer:
Step-by-step explanation:
√80 = √(2⁴ × 5) = √2⁴ × √5 = 4√5
5 × 8√80 = 160√5
We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.
The formula we use is

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99
Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.
Using the z-score, our standard deviation (9) and our margin of error (3), we have: