Question

1. what is the approximate longitude of mainland africa’s westernmost point?

Explanation:

The westernmost point of mainland Africa is Cape Verde (or Cap-Vert) in Senegal. Its approximate longitude is around \(17^\circ \text{W}\) (17 degrees west). This is a well - known geographical fact related to the location of Africa's western extreme.

Answer:

Approximately \(17^\circ \text{W}\) (17 degrees west longitude)