Problem 1. Population data for San Diego County, CA, from 1930 to 1990, are presented in the figure below. During this time, the population in the county has grown dramatically, going from 209,659 in 1930 to 2,520,500 in 1990. The county has hired you as the high-priced consultant to help them with some long range planning issues. As part of this project, you need to make some population projections a. In 1992, the overall birth rate in San Diego was 19.3 births per 1,000 population per year, the mortality rate was 7.1 deaths per 1000 population per year, and the net migration (domestic intra U.S. plus foreign) was 30.8 per 1000 population per year. Calculate the average annual population growth rate for San Diego from this information, as people per year per 1000 population and as percent per year. b. Assuming exponential growth, use the average annual growth rate you calculated in part (a) to predict the population in the county in the year 2020, using the 1990 population as the time zero value. 4000000 3500000 3000000 2500000 2000000 1500000 1000000 500000 1950 Date (Year) Poplation 1920 1930 1940 1960 1970 1980 1990 2000
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
Given
a)
Overall birth rate is 19.3 births per 1000 people.
Overall death rate is 7.1 deaths per 1000 people
Net migration is 30.8 people per 1000 people
The annual population growth rate is calculated as shown below
The average annual growth in San Diego population in 1992 is 43 people per 1000 population per year.
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