The model shows the expression 21+9 wich expression is equivalent to this sum

A

Step-by-step explanation:

First way to do this:

3(7 + 3)

7 + 3 = 10

10 multiplied by 3 = 30

Second way to do this:

3(7 + 3)

3 multiplied by 7 = 21

3 multiplied by 3 = 9

21 + 9 = 30

Hope I helped :)

Please consider Brainliest :)

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

765238725478629038640962136509762139056074

step-by-step explanation:

64087235609746097215074621039754021037