Atrain travels 51 kilometers in 4 hours, and then 69 kilometers in 5 hours. what is its average speed?

add the mileage 51+69 = 120 km

 add the times 4+5=9 hours

 now divide the two

120/9 = 13.3 km per hour average speed

6.5

step-by-step explanation:

you said it was in the question

~courtney

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.