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noname [10]
3 years ago
14

What is the area of this figure?

Mathematics
2 answers:
guapka [62]3 years ago
6 0
The area is 81 sq cm
Fofino [41]3 years ago
4 0
The area will be 81 squared centimeters. 
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A soft drink manufacturer wishes to know how many soft drinks adults drink each week. They want to construct a 85% confidence in
andreev551 [17]

Answer: 547

Step-by-step explanation: The margin of error formulae is given below as

Margin of error = critical value ×(σ/√n)

Where σ = standard deviation and n is the sample size.

From our question, margin of error = 0.08

Variance is 1.691,

hence σ = √variance = √1.691

= 1.3.

We will be using a z test for our critical value this is because a soft drink manufacturer will always produce drinks more than 30 in numbers.

The critical value for a 85% confidence interval is 1.44.

Hence critical value is 1.44.

By substituting the parameters, we have that

0.08 = 1.44 × 1.3/ √n

0.08 = 1.873/ √n

By cross multiplying

0.08 × √n = 1.873

√n = 1.873/ 0.08

√n = 23.41

n = (23.41)²

n = 547.

7 0
3 years ago
The reading speed of second grade students in a large city is approximately​ normal, with a mean of 90 words per minute​ (wpm) a
Genrish500 [490]
The probability is 0.2743.

Calculating the z-score for this time, we have:

z = (X-μ)/σ
z = (96-90)/10 = 6/10 = 0.6

Using a z-table (http://www.z-table.com) we see that the area to the left of this, less than this score, is 0.7257.  This means the area greater than this would be 1-0.7257 = 0.2743.
6 0
3 years ago
Read 2 more answers
Which statement is false?
likoan [24]

Answer:

options a is answer

Step-by-step explanation:

options a is answer

7 0
2 years ago
Consider the Fourier sine series of each of the following functions. In this exercise do not compute the coefficients but use th
tekilochka [14]

Answer:

Step-by-step explanation:

6 0
2 years ago
Train revived a raise of $80 per week. If he was making $500 per week before the raise, what is the percent change in his earnin
kotegsom [21]

Answer:

Train got a raise of 16%

Step-by-step explanation:

To find this, start by taking the equation for percent change

(New - Old)/Old * 100 = % Change

Now plug in known values

(580 - 500)/(500) * 100 = % change

80/500 * 100 = % change

.16 * 100 = % change

16 = % change

3 0
3 years ago
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