book Maths Puzzle Numerical Ability

Hello I am trying to find out if we are doing this problem correctly
5.4+3(8-5)

8-5=3
5.4=20
3.3=9
20+9=29

Please help

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book Other Question

y= - 3x -1 how do you do this? Can you please help me with this problem.

At each game, a local ballpark earns approximately $1815 total from concession sales. Each ticket costs $9. The ballpark must pay a to