You're using a compass to drive 23 degrees east of north express your direction in another way using an acute angle and two of the four directions north south east and west explain your reasoning

A complete circle is 360° and is divided into 4 equal parts: North, South, East, and West. Each of these will equal 90°. 90°-23°=67° , so you would be driving 67° North of East. 67° is an acute angle.

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.