9514 1404 393
Answer:
49
Step-by-step explanation:
Put the variable values in place of the corresponding variables, and do the arithmetic.
x² +3(x +y) =
5² +3(5 +3) = 25 +3(8) = 25 +24 = 49
Answer:
a)
b) n = 381
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
90% confidence level
So , z is the value of Z that has a pvalue of , so .
a. Assume that nothing is known about the percentage of computers with new operating systems. n = ?
When we do not know the proportion, we use , which is when we are going to need the largest sample size.
The sample size is n when M = 0.01.
b. Assume that a recent survey suggests that 99% of computers use a new operating system. n = ?
Now we have that . So
Rouding up
n = 381
When the solid is a cube,its volume is equal to its side raised to the power of 3. The equation is written below:
V = s³
Since 1,000 is raised to the power of 3, then it means that the side length is equal to 1,000 inches. The base of the cube is also a square. Thus, its area is s². Note that there are 12 inches in 1 ft.
A = (1000 in * 1ft/12 in)² = 6,944.44 ft²
Thus, the area of the base is greater than 1 square foot.