What is the function written in vertex form

Janets dinner costs 7.50. if she wants to leave a 10% tip how mich extra should she leave

Aboat's value over time is given as the function f(x) and graphed below. use a(x) = 400(b)x + 0 as the parent function. which graph shows the boat's value increasing at a rate of 25% per year?

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.