content area top Part 1 Check hereLOADING... for instructional material to complete this problem. Evaluate StartFraction a minus b Over c minus d EndFraction for the given values of a, b, c, and d. a equals 8 comma b equals 4 comma c equals 7 comma d equals 9 Question content area bottom Part 1 StartFraction a minus b Over c minus d EndFraction equals negative 4 (Type an integer or a simplified fraction.)