Answer:
Speed of Charles = 12 Km per hour
To convert it into meters per minute, we follow the following procedure
1 Km =1000 meter
1 hour = 60 minute
Now 12 Km per hour = 
= 12,000 ÷ 60
= 200 meter per minute
QA.
<span>Assuming the dimensions have to be in exact feet then you could have </span>
<span>9ft *9ft = 81square feet </span>
<span>10 ft * 10 ft = 100 square feet </span>
<span>11 ft * 11 ft = 121 square feet. </span>
<span>QB. </span>
<span>If each tile is 1 ft * 1 ft ie 1 square foot </span>
<span>Then </span>
<span>9' * 9' would mean 125 - 81 = 44 tiles would not be used </span>
<span>10' * 10' = 125 - 100 = 25 tiles not used </span>
<span>11' * 11' = 125 - 121 = 4 tiles not used </span>
Answer: x=23 degrees
Step by step: 90-67=23