Answer:
r = -4/5
Step-by-step explanation:
Divide both sides by 15 so you have r
-12/15 simplify (both by 3)
-4/5
For this case, the first thing we must do is define variables.
We have then:
x: number of minutes
y: final temperature
We write then the equation that models the problem:

For y = 20 we have:

Clearing x:
Answer:
The temperature of the water will be 20 degree celcius after 150 minutes
<span>
Using Pythagoras' theorem it is 6 times the sq rt of 5 which is about 13.416
</span><span>feet to 3 decimal places </span>
X+ y = 44
x - y = 6
—————
2x = 50
x = 25
y = 44-x = 19
A = l*w
A = 4*12 = 48cm^2
The area of the rectangle is 48cm^2 (cm squared)