Will mark brainliest!
(problem below)

Helena

Step-by-step explanation:

7y^2z is not modified in either the answer or the question.

6yz^2 - 3yz^2 = 3yz^2

-5 + 2 = - 3

Combining the the partial answers, you get

7y^2 + 3yz^2 - 3

which is the same as the original question.

Joe

Hope this helps!

yes he can

Step-by-step explanation:

Using ASA congruency theorem:

angle ABD=CBD=ADB=CDB and BD concludes they are congruent triangles