How many lines of symmetry does the letter i have

Asphere has a diameter of 10 in. what is the volume of the sphere?

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2