If 126 base n =86 base ten, find the positive value of n

Can i get some on 18,20,& 22? or one of them

Find two rational expressions that have the difference of 2-n/n-4

Organisms that live in the alpine and taiga biomes have developed unique adaptations that aid in their survival. the douglas-fir is a conifer tree that grows in the taiga biome. it has an average height of about 70 feet, and its wood is an important source of lumber.