Multiply the change per hour by the number of hours:
3.5 degrees per hour x 2.5 hours = 8.75
Since the temperature dropped, the change would be a negative value.
The change was -8.75 ( -8 3/4) degrees.
3x²–243=0 —> 3 (x²–81) = 0 —>
x²–81=0 —> (x-9)(x+9)=0
x-9=0 —> x=9
x+9=0 —> x=–9
I hope I helped you^_^
Answer:
the answer is 7.
Step-by-step explanation:
here's why......if u place the 3 where a is it will become multiplication so that would be 2 times 3 minus b now but if u place -1 the minus becomes addition so it will be 6+1 which is 7.
The required time is mathematically given as
t-150 minutes.
This is further explained below.
<h3>What is the time?</h3>
We know that the volume of the prism is given by.
Volume
Base Area
Base Area
Now,
Given that there is a twenty percent drop in the level of the pond during the first thirty minutes.
Because of this, the volume increases.
Now, the rate of emptying the tank is,
In conclusion, We also know that,
$$
Therefore, Colin must wait for the pond to drain for a total of 150 minutes.
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