A simple 9th Grade Math Question. I need help. Any help will be appreciated. The soldiers at the parade lined up in a rectangle with 10 rows and 5 columns. You

need to choose three soldiers so that neither two of them stand in the same row or

in the same column. How many different combinations of such choices are there?

P. S. 19 points for this! Please do answer quick!

1     3    

step-by-step explanation:

hopefully im right

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions