3. WEATHER On a cold January day,
Mavis noticed that the temperature
dropped 21 degrees over the course of the
day to -9°C. Write and solve an equation
to determine what the temperature was
at the beginning of the day.
SET UP AN EQUATION AND SOLVE

-9 + 21 = t    t = 12°C.

Step-by-step explanation: For this problem lets have t be equal to the original temperature in the beginning of the day. The equation -9 + 21 = t represents this situation because it states that if we add the degrees that dropped to the current degrees  it will give us our original degrees.

Solve.

-9 + 21 = t (Simply add -9 + 21) -9 + 21 = (+12)

12 = t

So, the original degrees in the beginning of the day was 12°C.

i believe the answer is 323 ft

step-by-step explanation: