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12345 [234]
3 years ago
7

Evaluate 23x-1 for x = 1.

Mathematics
1 answer:
Fed [463]3 years ago
7 0
Using the order of operations (PEMDAS)...

23 · 1 - 1 = ?
23 - 1 = ?
22

The answer is 22

Hopefully this helps! If you have any more questions or don't understand, feel free to DM me, and I'll get back to you ASAP! :)
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A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measurin
Ratling [72]

Answer:

The standard deviation of weight for this species of cockroaches is 4.62.

Step-by-step explanation:

Given : A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

To find : What is the approximate standard deviation of weight for this species of cockroaches?

Solution :

We have given,

Mean \mu=50

The sample mean x=55

A lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

i.e. P(X>55)=14%=0.14

The total probability needs to sum up to 1,

P(X\leq 55)=1-P(X>55)

P(X\leq 55)=1-0.14

P(X\leq 55)=0.86

The z-score value of 0.86 using z-score table is z=1.08.

Applying z-score formula,

z=\frac{x-\mu}{\sigma}

Where, \sigma is standard deviation

Substitute the values,

z=\frac{x-\mu}{\sigma}

1.08=\frac{55-50}{\sigma}

1.08=\frac{5}{\sigma}

\sigma=\frac{5}{1.08}

\sigma=4.62

The standard deviation of weight for this species of cockroaches is 4.62.

4 0
3 years ago
Andrew borrowed $700 from the bank to start a pressure washing business. The bank charged a simple interest rate of 7% per year.
Flauer [41]

Answer:6%

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Are 7 and 8 right. Plz help
MAXImum [283]
8 is right but 7 is wrong. The correct answer for 7 is 15÷(1+2)=5
4 0
3 years ago
Read 2 more answers
What is sqrt(405x ^ 7)?​
xxTIMURxx [149]

Answer:

(405x ^ 7)²

405²x^14

164025x^14 is a square of 405x ^ 7

Step-by-step explanation:

8 0
2 years ago
What type of heat transfer is responsible for an ice cube melting in your hand?​
Orlov [11]

Answer:

conduction

Step-by-step explanation:

The heat in the hand conducts into the ice to cause it to melt.

4 0
3 years ago
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