Based off of the formula you were given (-b/2a), ply the numbers into it
-(-20)/2(-2)
20/-4
Axis of Symmetry=5
For this you have to do sin of 30 degrees so if you have a calculator put sin(30)= a/44 and solve for a
If you type in both the coordinates it’ll give you the answer on google. That’s how I did this.
The odds of 1 coin landing tails is 1/2, for 2 coins it would be 1/4, 3 would be 1/8, 4 would be 1/16, etc.
the way you find this is by doing 1/2^n where n is the number of coins you have. if you plug in 20, you get 1/1,048,576