A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of and then an additional cents per minute of use. In Plan B, there is no monthly fee, but the customer pays cents per minute of use. For what amounts of monthly phone use will Plan A cost at least as much as Plan B?
Use for the number of minutes of phone use in a month, and solve your inequality for .

Provide an example of a trigonometric function and describe how it is transformed from the standard trigonometric function f(x) = sin x, f(x) = cos x, or f(x) tan x using key features.

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?