Which shows the algebraic representation of the phase and its value when n=4.2? twenty-eight plus the product of five and a number:

Put this into an equation like this: 
28 + 5n = x 
Now solve for x when n = 4.2. 
28 + 5(4.2) = x 
Multiply 5 by 4.2 and get 
28 + 21 = x 
Add 28 and 21 together to get 
49 = x 

So, the equation showing the phrase and its value when n = 4.2 would be 
28 + 5(n) = 49 
Hope this helps!

It’s 24.6 after you round to the nearest tenths the answer should be 25.0