What do the parentheses mean in the expression 8(5x+9x+6)

Benito is selecting samples of five values from the table, which row will result in the greatest mean? population data row 1 4 2 2 3 3 row 2 3 3 4 3 2 row 3 2 4 3 4 3 row 4 3 4 4 7 3 row 1 row 2 r

Find the cosine function that is represented in the graph.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68