Plz help questions are in the image

Which facts are true for the graph of the function below? check all that apply. f(x) = log8 x

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax