Which type of data would best describe displayed in a dot plot

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Find the quotient. 50a2 – 98b2 -5a +7b

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?