Answer:
The letter "i" is used to signify that a number is an imaginary number.
Step-by-step explanation:
An imaginary number is one that gives a negative result when squared. This differs from when you square real numbers where you always get a positive result. For example:
i = √-1
Imaginary numbers can be especially useful when trying to find the square root of a real negative number such as -16. Normally we cannot find the square root of -16 but through the use of imaginary numbers we can:
√-16 = 4i
~Hope this helps!~
It is given in the question that
Ann, Chang, and Kareem sent a total of 89 text messages over their cell phones during the weekend. Ann sent 9 fewer messages than Chang. Kareem sent 3 times as many messages as Ann.
Let number of messages Chang sent be x. And Ann sent 9 fewer than Chang, so Ann sent (x-9) messages. And Kareem sent 3 times as many messages as Ann, so Kareem sent 3(x-9) messages.
And the total messages are 89. That is
![x+x-9+3(x-9)=89](https://tex.z-dn.net/?f=x%2Bx-9%2B3%28x-9%29%3D89)
Combining like terms
![x + x - 9 + 3x-27 =89 \\ 5x -36=89 \\ 5x = 125 \\ x =25](https://tex.z-dn.net/?f=x%20%2B%20x%20-%209%20%2B%203x-27%20%3D89%0A%5C%5C%0A5x%20-36%3D89%0A%5C%5C%0A5x%20%3D%20125%0A%5C%5C%0Ax%20%3D25)
So Chang sent 25 messages, Ann sent
![25-9=16 messages](https://tex.z-dn.net/?f=25-9%3D16%20messages)
And Kareem sent
![3*16 = 48 messages](https://tex.z-dn.net/?f=3%2A16%20%3D%2048%20messages)
![\sqrt{16-x}](https://tex.z-dn.net/?f=%20%5Csqrt%7B16-x%7D%20)
x=8
16-8=8
![\sqrt{8}](https://tex.z-dn.net/?f=%20%5Csqrt%7B8%7D%20)
Use a calculator to find the square root of 8.
It would be 220 rounded to the nearest ten because the number in the ones place does not equal or exceed 5.
So 220 is your answer :)
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