For.One chemistry text Mike had 15 questions. Of these questions mike answered 80%

Mike answered 12 questions correctly on his test.

Step-by-step explanation:

Given:

Mike had 15 questions for chemistry text.

Of these questions mike answered 80% of them correctly.

Now, to find the questions Mike correctly answer on his test.

Total number of questions for the chemistry test = 15.

Rate of questions correctly answered = 80%.

So, to get the number of questions Mike had correctly answered:

Therefore, Mike answered 12 questions correctly on his test.

B

Step-by-step explanation:

As T is the midpoint of SU, ST=TU. 9x=5x+28, 4x=28, x=7. ST=TU=63 and SU=126