Consider u = {x|x is a positive integer greater than 1}. which is an empty set? {x|x ∈ u andone-half is prime} {x|x ∈ u and 2x is prime} {x|x ∈ u andone-half can be written as a fraction} {x|x ∈ u and 2x can be written as a fraction}

Linet passes through (4.5) and is perpendicular to the line shown on the condirate grid. what is the equation of line t in standard form?

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

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!