Answer:
see explanation
Step-by-step explanation:
Under a clockwise rotation about the origin of 90°
a point (x , y) → (y , - x)
Since the ratio is 3:4, and 12/4 is 3 than you do 3x3 and get 9 so the answer is 9:12 or 9 boys and 12 girls. To check your answer, you can do 3/4 (for 3:4) and that is 0.75. If you do that with 9:12 you also get 0.75.
Answer:

Step-by-step explanation:
First, make them on one side of the formula in the form of
which is 
Next, insert the corresponding number in the quadratic formula,
, and the answer can be calculated.
Answer:
36
Step-by-step explanation:
A square has equal sides.
Area= lenth * width
6*6=36