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2 years ago

6

I dive to 17 metres for 23 minutes. after a 30 minute surface interval, i plan to dive to 16 metres. what is the maximum allowab

le time for the second dive

1 answer:

STALIN [3.7K]2 years ago

5 0

Answer:

i don't know

Step-by-step explanation:

i don' know

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Which of the following expressions is equal to -1?<br> sec90°<br> sin180°<br> csc270°

ahrayia [7]

Answer:

csc 270° is the answer.

6 0

3 years ago

Please answer this I will give brainliest- Functions

alexandr402 [8]

Answer:

1. Not a function

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20. Function

This took a long time to write -_-

Step-by-step explanation:

8 0

3 years ago

Prove the formula for (d/dx)(cos−1(x)) by the same method as for (d/dx)(sin−1(x)). Let y = cos−1(x). Then cos(y) = and 0 ≤ y ≤ π

alexandr402 [8]

Answer:

$\frac{d\,arccos(x)}{dx} =-\frac{1}{\sqrt{1-x^2} }$

See the proof below

Step-by-step explanation:

if $y=arccos(x)$ , then : $cos(y)=cos(arccos(x))=x$

We can then apply the derivative to both sides of this last equation and remember to use the chain rule as we encounter the variable "y":

$cos(y)=x\\\frac{d}{dx} cos(y)=\frac{d}{dx} x\\-sin(y)\,\frac{dy}{dx} =1\\\frac{dy}{dx} =-\frac{1}{sin(y)} \\\frac{dy}{dx} =-\frac{1}{\sqrt{1-cos^2(y)} }\\\frac{dy}{dx} =-\frac{1}{\sqrt{1-x^2} }\\\frac{d\,arccos(x)}{dx} =-\frac{1}{\sqrt{1-x^2} }$

7 0

3 years ago

A. Consider the following algorithm segment: for i := 1 to 4, for j := 1 to i, [Statements in body of inner loop. None contain b

yuradex [85]

Answer:

(a) 4i times

(b) "i × n" times

Step-by-step explanation:

(a) Given the algorithm segment;

for i := 1 to 4, (Outer loop)

for j := 1 to i (Inner loop)

next j,

next i

The inner loop runs for i times, while the outer loop runs for 4 times.

The total times the inner loop would run when the entire algorithm is run is:

= i × 4

= 4i times

(b) Given the algorithm segment;

for i := 1 to n, (Outer loop)

for j := 1 to i (Inner loop)

next j,

next i

Where n is a set of positive integers.

The inner loop runs for "i" times, while the outer loop runs for "n" times.

The total times the inner loop would run when the entire algorithm is run is:

= i × n

= "i × n" times

6 0

3 years ago

The Denver Police Department wants to know if Hispanic residents of Denver believe that the police use racial profiling when mak

Marina86 [1]

Answer:

a) The population is all the Hispanic residents of Denver.

The sample is 300 adults which very visited by the officer.

b) The results are likely to be biased because the adults may be fearful of the Hispanic officer, may be intimidated by their presence and not want to tell how they really feel about this question.

Step-by-step explanation:

This is a common statistic method.

If you want to estimate something about a big population, you select a random sample of the population, and estimate for the entire population.

For example, if you want to estimate the proportion of residents of Buffalo, New York, that are Buffalo Bills fans, you are going to ask, for example, 1000 Buffalo residents. The population is all the residents of Buffalo, New York. and the sample are the 1000 Buffalo residents.

However, if you send a Bills player to ask this question, people will try to make him happy, which could lead to a biased answer.

So, for this question

a. What are the population and the sample?

The population is all the Hispanic residents of Denver.

The sample is 300 adults which very visited by the officer.

b. Why are the results likely to be biased even though the sample is an SRS?

The results are likely to be biased because the adults may be fearful of the Hispanic officer, may be intimidated by their presence and not want to tell how they really feel about this question.

5 0

3 years ago