The effect of the stratosphere being colder at the bottom than at the top is: -sudden weather changes
-better radio reception
-no vertical air movement
-the separation of gases into layers

Which graph represents an even function?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

What is the value of x in this triangle? a. 53° b. 62° c. 65° d. 118°