U is 10. If you subtract 11 first to get the variable and it's coefficient on its own, you see that 3u=30. To get the u on its own, you divide both sides by three. This gives you u=10
so you would multiply 3 by the sum of 24 and 9...
3(24+9)=3(33)=99
She bought 8 apples..................
Considering there is not much information my best guess would be 175-28x
Check out tiger algebra you can get an answer there good luck
