Exponential Evaluate

A new car cost $15,000 to build in 2010. The company’s financial analysts expect costs to rise by 6% per year . The cost to build the car can be modeled by the function f (t) = 15,000 (1.06)^t , where t is the number of years after 2010. How much will it cost the company to build the car in 2017?

Evaluate the function for the given value: $$f\left(x\right)=5^{3x}$$  for $$f\left(2\right)$$  

An investment of $8000 in a certain Certificate of Deposit (CD) doubles in value every seven years. The function that models the growth of this investment is f\left(x\right)=8000\left(2\right)^{\frac{x}{7}}, where x is the number of years. If the investor does not withdraw any money from this CD, how much money will be available for withdrawal after 28 years?

A population of amoebas in a petri dish will triple in size every 20 minutes. At the start of an experiment the population is 800. The function $$f\left(x\right)=800\left(3\right)^{\frac{x}{20}}$$  

where x is the number of minutes models this population. What would be the population of amoebas after 80 minutes?

A petri dish contains 35 bacteria. The bacteria triple every hour. The function $$f(x)=35(3)^x$$   models the number of bacteria present. How many bacteria are present after 4 hours?

Is the pictured graph growth, decay, or linear or none?  

Is the graph exponential growth or decay?

Which table represents the following equation?

Is the pictured graph growth, decay, or linear or none?  

Is the pictured graph increasing, decreasing, or neither?