For the function f(x)= x^2-9, what are a and b (the two values for f(x) missing from the table)?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Given right triangle abc, what is the value of tan(a)?