3x+5+10x-7=180
13x-2=180
-2 -2
13x=182
/13 /13
X=14
3(14)+5=47
10(14)-7=133
mm
10)

11)

12)

13) (your answer is incorrect)

14) (your answer is incorrect)

15)

16)
-expression to represent this situation

Answer: In 1 group 57 students
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P.S. Hello from Russia :^)
1 is 4 and 4 and 4 is 11 and 5 is 15
The value of the function is the Y value where the line crosses the given X value.
When X is at -2, the line is on Y = 3
The answer would be y =3