I had found these examples for more practice but I have no idea how to do them.

1. In 2008, Marianna paid $14500 for a used 2005 van. She has been tracking the selling price of the van as time passed to decide how long to keep the van before replacing it. The data she has collected is shown in the following table:

Age(in years): 3, 4, 5, 5, 7, 8

Selling Price ($): 14500, 11600, 8700, 6800, 4300, 3500

a) what is the initial selling price of the van in 2005?

b) what is the annual depreciation rate of the van.

2) In a study, researchers found that the arterial blood pressure, P, in millimeters of mercury (mmHg) is related to the volume, V, of the blood vessel in microlitres (uL). The data gathered is listed in the following table.:

Arterial Blood, P (mmHg): 70, 100, 120, 140, 160

Blood Veseel Volume, V (uL): 0.63, 0.80, 0.86, 0.90, 0.94

a) using a logarithmic regression, determine the equation that represents the relationship between blood pressure, P, and the blood-vessel volume, V.

b) Predict the blood vessel volume when the arterial blood pressure is 130 mmHg. Make sure to round your answer to the nearest hundredth of a microlitre. (how would you even predict that??)

c) Predict the arterial blood pressure when the vessel volume is 0.7 uL. Round your answer to the nearest millimetre of mercury.