1800×102/100=1836
for three years----->1836×3=5508
The area is(s^2)/2-(900/5)/2=90
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:

slope = (y2-y1)/(x2-x1)
m =(-2-7)/(8-0)
m =(-9/8)
slope is -9/8
the y intercept is 7 (0,7)
y = mx +b
y = -9/8 x+7
Answer: y = -9/8x +7