At an ice cream parlor, ice cream cones cost $1.10 and sundaes cost $2.35. One day, the receipt for a total of 172 cones and sundaes were $294.20. How many cones were sold??

Find the difference (8ab+a+2) - (3ab+6)

Find the domain of the following expression: 1/(√x)-2

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)