Draw or write to show two ways to use a doubles fact to find 6+7.

Doublets means when two same single digit number or two digit number are added, we get the result equal to number multiplied by 2.For Example

1+1=1×2=2

2+2=2×2=4

9+9=2×9=18

Now, we have to find sum Using doublets.

First Way

→6+7

=6+6+1

=2×6+1

=12+1

=13

Second way

→6+7

→7-1+7

→7+7-1

→2×7-1

→14-1

=13

idn

step-by-step explanation:

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: