Need math question asap, double 12 points!

The element is the entry in the 1st row and 3rd column of the matrix, which, in this case, is 7.

Edit: Got my rows/columns mixed up! Row 1, Column 3 is actually -1, as the original poster pointed out.

The row is the first number in a13. Rows go across. So you are in the top row.

The 3 or second number is the column. Columns go up and down.

Row 1 column 3 is the - 1.

The answer is C.

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation: