Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. [Start 4 By 4 Matrix 1st Row 1st Column negative 1 2nd Column negative 4 3rd Column 0 4st Column 1 2nd Row 1st Column 5 2nd Column 5 3rd Column 30 4st Column negative 5 3rd Row 1st Column negative 2 2nd Column negative 8 3rd Column 4 4st Column 2 4st Row 1st Column 0 2nd Column negative 1 3rd Column 2 4st Column 1 EndMatrix ]

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step-by-step explanation:

answer: sensy

step-by-step explanation:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

x-150=475   x=625

step-by-step explanation:

if the bike after the sale ($150) is $475 then just simply add 150 to 475.