Answer:
Assuming the wall is flat, X = 50.5
Step-by-step explanation:
180 degrees - 79 degrees = 101
101 / 2 = 50.5
Hope this helps :)
0.731 is greater than 0.73
Answer:

Step-by-step explanation:
The equation for exponential decay function is given as:

where:
D(t)= difference in temperature t=time
r=rate of change
a =initial value of the temperature
From the given problem:
Initial Temperature,a=50°C
Rate of Decay,r=
Therefore the function for the difference in temperature is given as:


We can convert
to decimal and write the function as:

60 because it has to equal at least 90 degrees