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AnnZ [28]
2 years ago
6

If both the length and width of a rectangle are doubled, how is the area of the rectangle changed?

Mathematics
1 answer:
Law Incorporation [45]2 years ago
7 0

Answer:

B) The area is four times larger

Step-by-step explanation:

A=LW

2*2*A=2L2W

4A=2L2W

Therefore, the area is four times larger

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A sample of 75 information systems managers had an average hourly income of $40.75 with a standard deviation of $7.00. The 95% c
IrinaVladis [17]

Answer: c. 39.14 to 42.36

Step-by-step explanation:

We want to determine a 95% confidence interval for the average hourly wage (in $) of all information system managers

Number of sample, n = 75

Mean, u = $40.75

Standard deviation, s = $7.00

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

40.75 +/- 1.96 × 7/√75

= 40.75 ± 1.96 × 0.82

= 40.75 + 1.6072

The lower end of the confidence interval is 40.75 - 1.6072 =39.14

The upper end of the confidence interval is 40.75 + 1.6072 =42.36

6 0
4 years ago
F(-4)f(x) = x^2 -3x + 9
olganol [36]

Here you go. Hope this helps! :)

4 0
3 years ago
The population of Greenvillie is approximately 75 times the population of fairview. The 3.75 x 10 to the power of 5 people livin
vampirchik [111]
The answer is a. 5 x 10³.

3.75 x 10^5 = 375,00.( population of Greenville)
 
375,000 ÷ 75 = 5,000 ( population of Fairview)

5 x 10³(1,000)= 5,000.
8 0
3 years ago
Read 2 more answers
The scale used on a map is 5 millimeters represents 32 kilometers. How many millimeters represent 160 kilometers?
Anika [276]

Use the proportion formula:

5mm/32= Xmm/160

=22.22 mm

5 0
3 years ago
Show problem set up for full credit.
ICE Princess25 [194]

Answer:

∠ QPR = 125°

Step-by-step explanation:

the angles subtended by 2 congruent arcs are congruent , that is

5x = 4x + 25 ( subtract 4x from both sides )

x = 25

Then

∠ QPR = 4x + 25 = 4(25) + 25 = 100 + 25 = 125°

5 0
2 years ago
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