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Allisa [31]
3 years ago
8

The square of 9 less than a number is 3 less than the number. what is the number?

Mathematics
1 answer:
Veronika [31]3 years ago
4 0
Would the answer be 6
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In a random sample of microwave​ ovens, the mean repair cost was ​$ and the standard deviation was ​$. Using the standard normal
Semmy [17]

Complete Question

In a random sample of 13 microwave ovens, the mean repair cost was $90.00 and the standard deviation was $15.20. Using the standard normal distribution with the appropriate calculations for a standard deviation that is known, assume the population is normally distributed, find the margin of error and construct a 98% confidence interval for the population mean u. A 98% confidence interval using the t-distribution was (78.7,101.3). Compare the results. The margin of error of u is

Answer:

The value  is  E = 11.65

Step-by-step explanation:

From the question we are told that

    The sample is  n  = 13

     The sample mean is  \= x  =  \$ 90

     The standard deviation is  \sigma = \$ 15.20

      The  lower limit of the  98% confidence interval is a =  78.7

      The  upper  limit of the  98% confidence interval is b =  101.3

Generally the margin of error is mathematically represented as

        E = \frac{b-a}{2}

=>    E = \frac{ 101.3 - 78 }{2}

=>    E = 11.65

7 0
3 years ago
I Need Help on this Math Problem!
maw [93]

Step-by-step explanation:

1. vertically opposite angles are the same

b = 42

360 - (42 + 42)

360 - 84 = 276

276 ÷ 2 = 138

c = 138

2. angles in a triangle sum to 180

right angles = 90

180 - (90 + 62)

180 - 152 = 28

angle S = 28

3. 1st question no, unless one angle is given a number. angles are the same vertically opposite so the other 2 angles are also vertically opposite but angle is different size but by adding the 2 different angles, make them supplementary as they sum to 180. 2nd question yes. you could have 4 right angles.

7 0
3 years ago
Please help with this
WINSTONCH [101]

Answer:

x = 25

Step-by-step explanation:

Step 1: Make a proportion

40/20 = 50/x

Step 2: Solve your proportion

2 = 50/x

2x = 50

x = 25

3 0
3 years ago
Read 2 more answers
Montella selling roses for four dollars each to raise money for a local charity if you spends 184 to buy the flowers roses Xmas
Dmitry_Shevchenko [17]

Complete question :

Montel is selling roses for $4 each to raise money for a local charity. If he spend $184 to buy the flowers, how many roses ,x, must Montel sell to make a profit of at least $360

Answer:

x > 136

Step-by-step explanation:

To make a profit of $360

Selling price per rose = $4

Amount spent on roses = $184

To male a profit of at least $360

The total revenue made from rose sale must be :

Cost price + profit made

$184 + $360 = $544

To make a profit of at least, $360, them he must sell at least :

$544 / selling price

$544 / $4

= 136

x > 136

8 0
3 years ago
A biologist is studying a bacteria population that initially contains 10^3 bacteria. In the lab, the population doubles every we
iragen [17]

Answer: 8000

Step-by-step explanation:

From the question, we are informed that the expression 10³ × 2^w models the population of the bacteria after w weeks.

The number of bacteria that will be present in 3 weeks will then be:

= 10³ × 2^w

= 10³ × 2³

= 1000 × 8

= 8000 bacterias

4 0
3 years ago
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