Which algebraic rule describes the 180° counter-clockwise rotation about the origin?

Step-by-step explanation:

We are asked to write the algebraic rule that describes the 180° counter-clockwise rotation about the origin.

When we rotate a point 180 degrees about origin the coordinates of point changes their sign.

The point after a rotation of 180 degrees about origin changes to .

The rule for this rotation is:

Therefore, our required expression would be .

$20.01

step-by-step explanation:

the sale price is (1.00 - 0.77)($87), or 0.23($87), or $20.01.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x