Ijust need with 18.- i have to get it done before tomorrow

Ten times the square of a non-zero number is eqaul to ninety times the number

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Jose is going to use a random number generator 500500 times. each time he uses it, he will get a 1, 2, 3,1,2,3, or 44.