exam Maths Puzzle Numerical Ability

Police chief wants to locate enough police stations so that each sector of the city has an average response time of 6 minutes. Find the minimum number of facilities needed and the

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i need to find the Foci of 25x2+16y2+150x=160y-225
the 2 that is next to 25x and 16y is supposed to be squared but i didn't no how to do it. thanks for you help.
I am lost with this statistic, can anyone help me with this.

In an effort to determine the most effective way to teach safety principles to a group of employees, four different