In the beginning, there were approximately 109 million cell phone users in the United States. The number of cell phone users grew to approximately 300 million in 10 years. Write an exponential model that represents the number of cell phone users in the United States, where t represents the number of years. The base of your exponential model should be correct to three places after the decimal point.

109 trust me

step-by-step explanation:

faster, im not sure why but i know it is faster

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.