By adding taxes on the goods being carried by traders. Kingdoms would often thrive on taxes. Taxes would often come in form of goods or weapons. In most cases, food always used to pay for the services. This is because of the growing agricultural sector of many civilizations
<span>B)<span>employees should be hired according to overall intelligence</span></span>
The area of polygon MNOPQR is equal to the area of a rectangle that is 15 square units + area of a rectangle that is 2 square units.
<h3>How to calculate the area of this polygon?</h3>
First of all, we would determine the area of rectangle MNSR with a side length of 3 units as follows:
Area = L × W
Area = 3 × 5
Area = 15 square units.
Next, we would determine the area of rectangle MNSR with its dimensions as follows:
- Length = 7 - 5 = 2 units.
Thus, its area is given by:
Area = L × W
Area = 2 × 1
Area = 2 square units.
Therefore, the area of polygon MNOPQR is equal to the area of a rectangle that is 15 square units + area of a rectangle that is 2 square units.
Read more on rectangle here: brainly.com/question/25292087
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If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.