What dose how many mean in math

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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