Please help. Look at the img below

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

17 in long 1.3 ft wide and 8in high what is the volume

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.