Answer:
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Step-by-step explanation:
Add 20, 19, and 17 when you get the sum of that then subtract the sum with 13 and you should get the answer which will be 43.
Answer:
A. T=7.12°C; B. t=3.32min
Step-by-step explanation:
In order to find the answer we can use the Newton's law of cooling:
where:
y0=initial temperature - room temperature
k=coefficients
t=time
Because the outdoors temperature is 3°C, the initial temperature is 20°C, and because the thermometer reads 11°C after 1min we have:



A. Temperature after an extra minute.

so the answer is 7.12°C
B. Time in order to read 4°C



The equation which represent total amount of income he earns from selling book is, 
Since, Selling price of one novel is n dollars
So, selling price of b books is, 
Since, he receives 9% commission on each book sale.
So, total commission he receives on selling of b books is,

And also he received a bonus of $50,000 to sign the contract to write the book,
So, total amount of income he earns is represented by A,

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