Robert works out 2.5 kilogram mass what is the 2.5kilograms mass into grams

To go from kilograms to grams, you must know how many grams there are in a kilogram, or how many kilograms there are in a gram.

To convert, set this up using unit analysis like so:

I chose to use a coefficient of 1 with the unit that has a prefix (kilograms), since this tends to make conversion easier.  However, you could also set up the conversion as:

In either case, you are trying to cancel kg, therefore units in kg must be in the denominator as shown.

2,500 grams

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.