The average age that a person has their first cell-phone has been decreasing
by approximately 10% each year since the year 2005. In the year 2005, a
person typically didn't get their first phone until the age of 20. The following
equation models the average age of getting their first cell-phone, y, as a
function of the number of years after 2005, x.
y = 20(0.9)*
Using this model, what is the predicted average age at which a person gets
their first cell-phone in the year 2020, rounded to the nearest tenth?
Answer =
years old

Solution:

The following  equation models the average age of getting their first cell-phone, y, as a  function of the number of years after 2005, x :

Using this model, what is the predicted average age at which a person gets  their first cell-phone in the year 2020, rounded to the nearest tenth?

x = 2020 - 2005 = 15 years

Substitute x = 15

Thus the average age at which a person gets  their first cell-phone in the year 2020 is 4 years old

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

where did you get them? if you picked from the grass, is is probably poisonous.

step-by-step explanation: