The pre-image and image of what transformation are not congruent?

d. dilation.

Step-by-step explanation:

A rigid transformations is a transformation which always produces an image that is exactly same shape and the size as the pre- image.

There are four kinds of rigid transformations:  

1) translation 2) reflection 3) rotation 4) glide reflection.

They all create congruent images.

A dilation is a transformation that creates an image that is the exactly same shape as the pre-image, but may have a different size.  

Thus, The pre-image and image of dilation are not congruent.

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this