Determine the value of b. answers: A) 30 B) 5.2 C) 4.8 D) 6.53

C

Step-by-step explanation:

These are similar triangles due to the SAS Postulate so we can set equal proportions using the side lengths:

Simplify:

You can simplify the left fraction even further:

Multiply both sides by 7:

Since 84/(12+b)=5, you can rewrite it easier:

Isolate the variable:

i think it would be 42cm

"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.