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:
Answer: x<4
Given the inequality:

We want to solve the inequality for x.
First, distribute the bracket on the right side of the inequality.

Next, subtract 10x from both sides of the inequality.

Add 24 to both sides of the inequality.

Divide both sides of the inequality by 6.

The solution to the inequality is x<4.
Integers are like -4,-3,-2,-1,0,1,2,3,4 etc
√49=7, integer
-3⁰=-(3⁰)=-(1)=-1, integer
1.2 times 10⁻²=1.2/100=0.012, not an integer
18/3=6, integer
answer is 3rd one
Answer:
Step-by-step explanation:
x=3 and x=-4 are parallel, vertical lines
:::::
x-y = 3, slope = 1
2x-2y = 10, slope = 1
Parallel lines
Maria do 1/2 work in 1 hour
Sasha do 1/3 work in 1 hour
Thus,
1/2+1/3=5/6 work in 1 hour
5/6 work in = 1 hour
1 work in =6/5=1.2 hours =72 minutes