Which algebraic representation of a transformation on a coordinate grid does NOT preserve congruence? A. ( x, y) -> ( x + 6, y + 6)

B. (x, y) -> (-x, y)

C. (x, y) -> (6x, 6y)

D. (x, y) -> (-y, x)

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.