How would i go about figuring this out? i need explanation not just answer

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?

Use set buikder notation to represent the following set: {, -2, -1, 0}

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?