Here you go, i added a bit of explanation as to why i used the numbers to help you understand the method :)
Answer:
Uh 90 i hope your kidding
Step-by-step explanation:
Answer:

Step-by-step explanation:
According to the First Law of Thermodynamics, the heat received by the metal cylinder is equal to the change in the internal energy. That is:


The specific heat is clear in the previous expression and finally computed:



The value of x that will make this equation true is 50.
0.5 times 50=25 -8 = 17
0.2 times 50= 10 +7 = 17
Therefore, your answer is 50.
2 and 5. 1 isn't apart of the list because the definition of a prime number is having 1 and itself as a factor. 1 only has the number 1.