Let A be the set of all polynomials in Q [x] with zero constant term. Prove this set is an ideal in q[x].

Which of the following transformations does not preserve congruence? * 5 points a. (x, y) → (y − 3, x − 3) b. (x, y) → (x + 5, y − 1) c. (x, y) → (y + 9, −x + 2) d. (x, y) → (3x + 1, 3y − 2)

Which expression can be used to find the cost of .75 kilogram of cheese at the price of $6.40 per kilogram?

Which inequality is used when the situation involves a “maximum”?