How are periodic phenomena relatively easy to model using trigonometric functions? what makes them difficult to model this way? explain your
reasoning .

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Which of the following contains a variable?