1. In 2002 the population of school children in a city was 90,000. This population increases at a rate of 2% each year. What will be the population of school children in year 2010? 2. Janine owns a chain of fast food restaurants that operated 200 stores in 1999. If the rate of increase is 8% annually, how many stores does the restaurant operate in 2007? 3. The number of insects in a colony doubles every month. At present there are 25 insects in the colony, about how many insects will there be in the colony after three months?

7. In 2011 there were about $3.5 billion in sales of organic goods in America. In 2016 this increased to $7.8 billion. Which of the following correctly describe the change... Pick all that apply. a. 123 % increase b. growth of $4.3 billion c. 223 % increase d. 23 % increase e. change of $4.3

help

A certain city's power company charges their residents for electricity usage on a daily basis. There is a basic charge of 11.57 cents. For each day the first 10 kWh cost 4.81 cents per kWh and any additional kWhs are 9.69 per kWh. (A kWh, or kilowatt-hour, is a unit of energy.) (a) Complete the following table using the information provided above. kWhkWh 0 5 10 15 20 cost (dollars)cost (dollars)           kWhkWh 25 30 35 40 cost (dollars)cost (dollars)         (b) We can define a piecewise function f(x)f(x) where xx is the kWh used in a day and f(x)f(x) is the cost, in dollars. This function would have the form   f(x)={g(x)h(x)ififx∈Ax∈Bf(x)={g(x)ifx∈Ah(x)ifx∈B What functions g(x)g(x) and h(x)h(x) make up the piecewise function f(x)f(x)? g(x)=g(x)= for A = h(x)=h(x)= for B = Hint: A and B are intervals. If an interval uses ±∞±∞ write inf or -inf . (c) Using the above function, what is the cost of 26 kWh? dollars. (d) For 3 dollars, what is the maximum kWh usage for one…