Exam Lesson Name: The Trades of Plumbing and Pipefitting Exam number: 286115RR
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Question 7 of 20
Select the best answer for the question
7. Which one of the following was once considered state-of-the art and is still used for control systems and instrumentation in buildings?
A. Steam
B. Brine
C. Compressed air
D. Deionized water

answer:

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explanation:

answer: excel provides a method to add or to remove borders around and between cells. instead of selecting cells first and then formatting, you can choose the formatting tool that you want to use, and then apply the format to one or more cells.

explanation: plz brainliest,im 1 more brainliest from ranking up< hop icould

answer:

// here is code in C++.

#include <bits/stdc++.h>

using namespace std;

//main function

int main()

{

  // variable

 int n;

 cout<<"enter a number:";

 // read the input

 cin>>n;

 // find the square root of the absolute value

 float square_root=sqrt(abs(n));

 // print the square_root

 cout<<"square root of "<<n<<" is: "<<square_root<<endl;

  return 0;

}

Explanation:

Read a number from user and assign it to "n".Then find its absolute value with abs() function.Then calculate the square root of the absolute value with sqrt() function.Print the square root of the number.

Output:

enter a number:-17

square root of -17 is: 4.12311

                                                         This is easy

                                                     sinserly Natalie 7 grader (this is not that hard)