An equation for the sentence would be g + 7 = 12, where g is the unknown number of gallons.
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Answer:
12
Step-by-step explanation:
So, she practices 12 hrs per week, and already has practiced 3 hrs this week.
This means she has 9 hrs left to practice.
3/4 of an hour is one session, so to find out the number of sessions she needs, you have to do (9 hours)/(one session)
which is basically 9 / ( 3/4)

She needs 12 more sessions.
17x + 16x + 12x =180
45x = 180
x = 4
Largest angle = 17*4 = 68 degrees