What transformation is represented by the rule (x, y)→(−y, x) ? rotation of 90° counterclockwise about the origin rotation of 180° about the origin reflection across the x-axis reflection across the y-axis

the answer is C. Reflection across the X-axis

Hope this helps!

rotation of 90° counterclockwise about the origin

Step-by-step explanation: 1.10 k12 right same it was wrong

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.