Final answer:
The expression 1/4 + 9/10y + 7/8 simplifies to 9/10y + 1 1/8. The terms involving 'y' cannot be simplified without further information.
Step-by-step explanation:
The original question seems to contain a mixture of unrelated mathematical expressions.
However, focusing on the initial expression, 'what is 1/4+9/10y+7/8 simplified', we can attempt to simplify this. If we are to assume that the 'y' is a variable and not a typo, the expression 1/4 + 9/10y + 7/8 cannot be simplified further without additional information about 'y'.
If 'y' is meant to be a specific numerical value, it would need to be provided for simplification.
It could be the case that the question is asking to simplify the numeric parts only which are 1/4 and 7/8. In that scenario, it is necessary to find a common denominator for 1/4 and 7/8, which is 8.
After conversion, we get 2/8 + 7/8 = 9/8 or 1 1/8.
Thus the simplified expression is 9/10y + 1 1/8, assuming 'y' remains an unknown variable.