Answer:the median is 20 and the lower quartile is 16.5
Step-by-step explanation:
Answer:
AC = 30
Step-by-step explanation:
Start with:

Combine like terms.

Subtract
from both sides of the equation.

Subtract
from both sides of the equation.

Then, substitute
for
in 

Multiply.

Finally, add.

Answer:
True
When you add two negative numbers the sum is always negative ex.
When you add two numbers with different signs get the difference and get the sign by the larger absolute value ex.
Step-by-step explanation:
No he did not because 20% of 250 is 50 and there are 90 students not 50 students!! Hope this helped you a lot !!!