To complete a job a crew of 8 people needs 18 days. How long will the same job be finished if the crew will have 9 people?
2 answers:
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We can write the system in the following form:
![\left[\begin{array}{cccc}5&-4&4&2\end{array}\right] \left[\begin{array}{c}x_1\\x_2\\x_3\\x_4\end{array}\right] =b](https://tex.z-dn.net/?f=%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcccc%7D5%26-4%264%262%5Cend%7Barray%7D%5Cright%5D%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bc%7Dx_1%5C%5Cx_2%5C%5Cx_3%5C%5Cx_4%5Cend%7Barray%7D%5Cright%5D%20%20%3Db)
The above system is equivalent to the following equation:
Of course, the above system has solution for any values of b since there is one equation and four variable, there is infinite number of solution each time.
The above system is equivalent to the following equation:
Of course, the above system has solution for any values of b since there is one equation and four variable, there is infinite number of solution each time.
-0.258 is a decimal number in which 2 is at the tenth place, 5 is at the hundredth place and 8 is at the thousandth place.
Therefore, the number in the fraction form is -
The fraction in the simplest form is -
-0.312 is a decimal number and its fraction form is -
The fraction in the simplest form is
-2.32 is a decimal number and its fraction in the simplest form is
-1.64 is a decimal number and its mixed number in the simplest form is
6.012 is a decimal number and the number in mixed number form is
-12.405 is a decimal number and the number in mixed number form is
Solution
Draw the diagram
So using cosine rule
