To find the average melting point of helium, hydrogen, and neon, we need to follow these steps:
1. Identify the variables:
- Let [tex]\( h \)[/tex] represent the melting point of helium.
- Let [tex]\( j \)[/tex] represent the melting point of hydrogen.
- Let [tex]\( k \)[/tex] represent the melting point of neon.
2. Sum the melting points:
- Add the melting points of helium, hydrogen, and neon together: [tex]\( h + j + k \)[/tex].
3. Calculate the average:
- The average (arithmetic mean) is found by dividing the sum of the values by the number of values. In this case, we have three elements, so we divide by 3:
[tex]\[
\text{Average} = \frac{h + j + k}{3}
\][/tex]
Thus, the algebraic expression that correctly describes the average melting point of helium, hydrogen, and neon is:
[tex]\[
\frac{h + j + k}{3}
\][/tex]
Hence, the correct answer is:
[tex]\[ \boxed{\frac{h+j+k}{3}} \][/tex]
So the correct option from the given choices is:
- C. [tex]\(\frac{h+j+k}{3}\)[/tex].
