What is the ratio of seats to wheels in a group of tricycles

Acircle has a circumference of 28.36 units what is the diameter of the circle

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

Bobs burgers bam has a special deal of 4 hamburgers for $6. at that rate, how much should it cost to buy 3 hamburgers?