book Maths Puzzle Numerical Ability

1.In the case of finding the value of the determinant how it is related to the set of linear equations?
2. what does it mean (physically) by multiplying the first element of first

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Brandon pays $4.95 a month for a long distance telephone service that offers a flat rate on 7 cents per minute. One month his total long distance bill was $10.69. How many minutes of long distance telephone calls were made that month? The wages of 5 newpaper carriers totaled $110 for 2 weeks work. How much will 3 carriers earn if they work for 3 weeks each at the same weekly rate?