Marcus walked 5 km due east and then he turned around and walk 5 km to west how many kilometers is marcus now from his starting point

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -4

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )

Can someone tell me if this is perpendicular? !