SCREEN TIME Gabriella wants to limit the amount of time she spends on
her phone. She decides to limit the time to 15 hours a week. Let t represent
the amount of time she spends talking on the phone or texting her friends,
and let u represent all other uses, such as streaming videos or music,
reading articles, or using other apps.
a. Write an inequality that describes the phone time limits in terms
of t and u.
b. Write an inequality that describes the limit on the average time a that
Gabriella should spend on each of the 2 types of uses of her phone.
c. One week, Gabriella spends 11.25 hours talking and texting on her
phone. What is the maximum amount of time she can spend for other
uses?