Answer:
A) 
B) T = -5 °C
Step-by-step explanation:
A) Let T be the change in temperature of the week. T is determined as the total temperature change (-20°C) divided by the number of weeks that have passed (4 weeks). The expression is:

B) In order to simplify the expression, simply perform the division.

This means that the temperature has dropped by 5 degrees each week.
Rules for dividing by 0
Rule 1.
0 divided by any number is 0.
Rule 2.
You cannot divide by 0.
Rules for dividing by 1.
Rule 1.
any number (except 0) when divided by itself equals 1.
Rule 2.
any number divided by 1 equals that number.
Answer:
= -
+ 2
Step-by-step explanation:
Solve for
by simplifying both sides of the equation , isolating the variable.
Hope this helped you, Also please let me know if anything is unclear or wrong!
Nine(9) is the Greatest common divisor