Which of the following constants can be added to x2 + x to form a perfect square trinomial?

x^2+x + 1/4

Step-by-step explanation:

x^2+x

Take the coefficient of x

1

divide by 2

1/2

Square it

(1/2)^2 = 1/4

Add this to make a perfect square trinomial

4.0217391 %

Step-by-step explanation:

The original prices times the tax rate  is equal to the tax

460 * tax rate = 18.50

Divide each side by 460

tax rate = 18.50/460

tax rate =.040217391

writing as a percent ( multiply by 100)

4.0217391 %