Which sum or difference is modeled by the algebra tiles?
(x2 + x) - (x2-3x - 1) = -2x - 1
(x2 + x) -(-x2 + 3x + 1) = -2x - 1
(-x2 + x) + (-x2 + 3x + 1) = -2% - 1
(-x2 + x) + (x2 - 3x + 1) = -2x - 1

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

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

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?