What are the square roots of 16 over 81 ?

a.
minus 2 over 3 and 2 over 3

b.
minus 4 over 9 and 4 over 9

c.
minus 8 over 9 and 8 over 9

d.
minus 4 over 3 and 4 over 3

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.

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.

Zach spent 2/3 hour reading on friday a 11/3 hlurs reading on saturday. how much more time did he read on saturday tha on friday