I will give brainiest to whoever answers correctly !!

The country's population decreased about 5.8 % during this time period.

Step-by-step explanation:

Population in 1990 = 164 million

Population in 2010 = 155 million

Determine the percent decrease

The formula used is:

We have :

Initial Value = 164 million (164,000,000)

New Value = 155 million (155,000,000)

Finding percent decrease

So, The country's population decreased about 5.8 % during this time period.

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answer: d.) the total number of protons and neutrons is 15

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your friendly neighborhood human spider! .