Someone pls help!! NO LINKS! spam and i’ll report ur comment. please explain well

Determine if the sequence is geometric. if it is, find the common ratio. 1) -2, 2/3, -2/9, 2/27 2) 0,2,5,9 3) 2, -10, 50, -250 4) 1,4,16,64

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?