225 is about 200

12 is about 10.

To put the same in each vase, we divide.

200÷10=20

So the answer for the best estimate would be D, 20 flowers.

**Answer: 11:30 pm**

S**Step-by-step explanation:subtract 1 hour and 15 minutes from 12:45**

**Answer:**

Multiply the second equation by 2

Solution:

**Step-by-step explanation:**

1) In order to use the elimination method to solve systems of equations, you must first multiply one or both of the equations so that the coefficients of a pair of terms with matching variables share the same number, but have opposite signs.

In this case, the y terms must fit that requirement. The y term in the first equation is 2y and the one in the second equation is -y. They already have opposite signs, one positive and other negative, so we just need -y to be -2y. So, in order to do that, multiply by 2.

2) After multiplying the whole second equation by 2, you will get . Now, add the the two equations together, eliminate the y terms, and isolate x to find its value.

3) Then, substitute that x value back into one of the equations to receive the y-value.

To better explain these steps, I attached pictures below.

**Answer:**

multiply either sides by 3:

divide either sides by πr² :