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Which of the following is correct interpretation of the expression -4+13

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?