Which two sampling methods require that the researcher know something about the salient characteristics of the population (such as race, ethnicity, or gender) before selecting samples?

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

Find the solutions for a triangle with a =16, c =12, and b = 63º

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato