The population of a city is growing exponentially. At the start of the year 2000, it had 7 million inhabitants and was growing at a rate of 80 thousand people per year. During which year will the population size reach 11 million people

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

What is the value of x when x + 7 = 21?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.