Element X decays radioactively with a half life of 12 minutes. If there are 160
grams of Element X, how long, to the nearest tenth of a minute, would it take
the element to decay to 2 grams?

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.

Nine more than four times a number is the same as one less than twice the number. find the number?

Can someone tell me if this is perpendicular? !