Julie is considering installing solar photovoltaic panels on the roof of her house. Her monthly electricity bills currently average $83. The cost of installing a photovoltaic system is $18,000; however, she expects a45 % reduction in this cost due to tax credits and local rebates. Assuming all of her electrical needs are met by the new system and neglecting possible revenue when the system puts electricity back into the grid, what is the approximate payback period for the photovoltaic system?

What is the prime factorization of 230

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

What is the volume of a cone with a height of 6 cm in the radius of 2 cm