The formula which calculates the total value of a single row of cells across a range of columns in Microsoft Excel is: =SUM(C15:Y15).
Microsoft Excel can be defined as a software program (application) that is typically designed and developed by Microsoft Inc., to avail its end users the ability to analyze and visualize spreadsheet documents.
A spreadsheet can be defined as a file or document which comprises cells in a tabulated format (rows and columns), that are typically used for formatting, arranging, analyzing, storing, calculating and sorting data on computer systems through the use of Microsoft Excel.
In Microsoft Excel, the SUMIF function is a function which is used to calculate the total value of cells that meet a specific criteria such as:
Hence, "=SUM(C15:Y15)" is a formula which can be used to calculate the total value of a single row of cells across a range of columns in Microsoft Excel.
Read more: https://brainly.com/question/24249483