In a competition of 50 professional ballroom dancers, 22 competed in the fox-trot competition, 18 competed in the tango competition, and 10 competed in both the fox-trot and tango competitions. How many dancers competed in either the foxtrot or tango competitions?

Yao xin puts 3/10 liters of potting soil in each pot for planting flowers. she has 5 2\3 liters of potting soil. how many pots can yao xin fill?

Which sentence uses an objective tone? we will plant the best garden of any school in the area. the new campus garden will surely be envied by other schools. a garden would provide numerous benefits to the students. you will probably agree that gardens have many benefits.

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12