4.
2x=10
x=5
Solution x=5
5.
Let x represent free throw that Juan have to make which is:
6+x=15
Subtract 6 for both side
x=9. As a result, Juan had to make 9 more free throw.
6.
x+8=15
x=7
9x=99
x=11
x+2=11
x=9
6x=54
x=9
x+4=13
x=9
5x=60
x=12.
As a result,
Greater than 10:
9x=99, and 5x=60
Less than 10:
x+8=15, x+2=11, 6x=54, and x+4=13. Hope it help!