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?

The answer is in the image 

Cost of 7 gallons=$24.50

Cost of 1 gallon=24.50/7=3.5

Cost of 15 gallons=15*3.5=52.5

Cost of 15 gallons will be $52.5

For 1 flavor there are 9 topping

Therefore, for 5 different flavors there will be 5*9 choices

No of choices= 5*9

=45 

The total nom of  code that can be used is equal to 5+3 = 8

The answer is in the image 

Salesperson will make 6% of 1800

=(6/100)*1800

=108

Salesperson will make $108 in $1800 sales

The answer is in the image 

The solution is given in the image below

Speed=Distance/time

Here,

distance=15m

time=1sec

speed=15/1=15m/sec

Distance=Speed*time

time=15min=15*60sec=900sec

Distance travelled in 15 min=15*900=13,500m

=13500/1000 km=13.5Km

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.