I have to find x with the numbers on the dilation

But I don’t know, please explain :(

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. after tax the total is 45.99. what percentage of the subtotal is the total?

Bring the fraction a/a-4 to a denominator of 16-a^2

Find the value of x. give reasons to justify your solutions! h ∈ ig