Rico is estimating 139 x 18. find his mistake and correct it. 100 x 10= 1000

2800

Step-by-step explanation:

We have been given that Rico is estimating . We are asked to find Rico's mistake.

We can see that Rico has rounded down 139 to 100 and 18 to 10.

Instead of rounding down the numbers, Rico should round up the numbers as ones place is greater than 5:

Therefore, the estimated product of the given numbers would be 2800.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,