I'm struggling with questions 5-8, I already have the answers for questions 1-4 which in case you need them and they are as follows. 1) Expected population size for each country: A - 333,833,520 B - 83,753,680 C - 357,821
2) Net or absolute growth for each country: A - 17,933,520 B - -1,096,320 C - 48,920 3) Percent-change for each country: A - 5.68% B - -1.29% C - 15.84% 4) Annual change for each country: A - 2,988,920 B - -182,720 C - 8,153.33 
5. Using the annual growth rates ( r ) given below, how many years will it take for each country to double in size? (3 points) Hint: use the "Rule of 70n and/or the exponential growth formula. If a country has a negative annual growth rate, your calculation will be for halving time (i.e., the time it takes for the country to decrease by half). 6. The current global growth rate is 1.05% or .0105 how many years would it take for the world population to .... Grow by 50% ? (3 point) Quadruple? (3 point) Hint: use the Exponential Growth Formula. Remember, net migration is 0 at the global level, so the rate of natural increase (RNI) is the growth rate (r) for the world population. 7. According to the US Census Bureau, the US resident population was 331,449,281 in mid-year 2020. According to current World Bank estimates, the US population is growing at a rate of 0.50% per year. If the United States continues growing at this rate, in what calendar year will it reach 500,000,000 people? (2 points) Hint: use the exponential growth formula to solve for n to get the information you need to answer this question. 8. If a population is growing at a rate that would cause it to double in 55 years, how long would it take for that population to increase by half (i.e, grow to 1.5 times its current size)? Hint: Use exponential growth formula - twice: First, solve for r. Then, use your calculated value of r to answer the question. (2 points) Use the following data table to answer questions 1-6. Fill in your answers on the grid at the bottom of the page 5. Using the annual growth rates ( r ) given below, how many years will it take for each country to double in size? (3 points) Hint: use the "Rule of 70n and/or the exponential growth formula. If a country has a negative annual growth rate, your calculation will be for halving time (i.e., the time it takes for the country to decrease by half). 6. The current global growth rate is 1.05% or .0105 how many years would it take for the world population to .... Grow by 50% ? (3 point) Quadruple? (3 point) Hint: use the Exponential Growth Formula. Remember, net migration is 0 at the global level, so the rate of natural increase (RNI) is the growth rate (r) for the world population. 7. According to the US Census Bureau, the US resident population was 331,449,281 in mid-year 2020. According to current World Bank estimates, the US population is growing at a rate of 0.50% per year. If the United States continues growing at this rate, in what calendar year will it reach 500,000,000 people? (2 points) Hint: use the exponential growth formula to solve for n to get the information you need to answer this question. 8. If a population is growing at a rate that would cause it to double in 55 years, how long would it take for that population to increase by half (i.e, grow to 1.5 times its current size)? Hint: Use exponential growth formula - twice: First, solve for r. Then, use your calculated value of r to answer the question. (2 points) Use the following data table to answer questions 1-6. Fill in your answers on the grid at the bottom of the page
