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