Why are " rules " important in mathematics?

Janice used a 16-inch dowel and a 21-inch dowel to build a kite what is the perimeter of her kite

What expression is equivalent to (-5) - 8?

A turtle walked in a straight line from 1:23 p. m. to 6:23 p. m. each hour, the turtle traveled four-fifths if a kilometer. How far did the turtle travel?

How many times can 2 go into 18

How many different flavors of ice cream would you need if you wanted there to be 35 combinations of 3 different scoops of ice cream

Trignometric ratios

Simplify | 4-9 | A) 13 B) 5 C) - 5 D) - 13

Plastic cups come in packages of twenty-four and straws come in packages of twenty. What's the smallest number of each that could be bought so that you had the same amount of cups and straws?

What is 12+2-8=6-12 = - 6 + 18

A ramp leading into a building makes a 15 degree angle with the ground. The end of the ramp is 10 feet from the base of the building. Approximately how long is the ramp? Round to the nearest tenth.