The Greek mathematician who wrote the most definitive text on geometry, one that is still referred to today is Euclid. Euclid of Alexandria is also called "Father of Geometry". He was a great Greek mathematician. Euclidean geometry is still widely taught in schools and colleges. I hope the answer comes to your help.
Answer:

Step-by-step explanation:
Hi there!
4x-6y
Plug in the values of x and y:



Thus,
is our final answer.
Hope it helps! Enjoy your day!
~Just a teen willing to help others

You can cross multiply to get 4 * 21 = 7x
84 = 7x; divide both sides by 7
12 = x so the number 12 will go in the blank (12 girls)
Answer:
What even is this???
Step-by-step explanation:
....
Answer:
25.12
Step-by-step explanation: