Montrer qu'il existe une bijection de Q dans N

What is 4x + 2 + 2x + x2 + x equal

Jack mows the lawns to earn money. he charges a flat fee of $20 for showing up plus $15 for each hour it takes him to mow the lawn. Write an equation that models this situation for the money Jack makes Y in terms of the hours he works X

X-4y=16 show me how to get y and x.

Find the integral of arccos x / sqrt (1-x^2) dx.

Is negative 5/16 greater less than or equal to negative 8/25

To decrease an amount by 23%, multiply by?

A garden (60 ft x 40 ft) is surrounded on all sides by a 5 foot walkway. What is the area of the garden? What is the area of the walkway? What is the perimeter along the outer edge of the walkway?

Josh cut a square sheet of paper along a diagonal to make two congruent triangles. The area of one triangle is 60.5 in." Find the length of one side, s, of the square. Show your work.

In a random sample of cars driven at low altitudes, of them exceeded a standard of grams of particulate pollution per gallon of fuel consumed. In an independent random sample of cars driven at high altitudes, of them exceeded the standard.

Suppose you do a favor for 3 people. then you ask each of them to do a favor for 3 more people, passing along the request that each person who receives a favor does a favor for 3 more people.