Lets get all the information we need first.
A week has 7 days, you practice 30 min each day, so in a week you will practice a total time t of 30 min for 7 times, that is:
t = 7day(30 min/day)
t = 210 min
So in a week you will practice a total of 210 minutes.
So you have the equation (2x+4)/-3=12
Multiply by -3 on each side.
2x+4=-36
2x=-20
x=-10
Hope this helps.
I'm so sorry for not answer but which grade and what workbook is it?
Answer:
ok ok ok ok ok ok okok ok ok
I believe that the answer is 20. I am not entirely sure though.
