HELP MIDDLE SCHOOL QUESTION

0.421

Step-by-step explanation:

There are two diagrams, one for 0.137, and one for 0.284.

I'll go place by place from least to greatest.

First, add 7 thousandths and 4 thousandths.

That will equal 11 thousands. That's greater than 9, so add 1 hundredth to the equation.

(0.1 + 0.2) + (0.03 + 0.08 + 0.01) + 0.001

Now, add 3 hundredths and 8 hundredths.

That will equal 11 hundredths. Add the other hundredth from the regrouping of the thousands for 12 hundredths. That is also greater than 9, so add 1 tenth to the quation

(0.1 + 0.2 + 0.1) + 0.02 + 0.001

Then, add 1 tenth and 2 tenths.

That will equal 3 tenths. Add the other tenth from the regrouping of the hundredths to get 4 tenths.

0.4 + 0.02 + 0.001

Now add 0.4, 0.02, and 0.001.

0.42 + 0.001

0.421

The answer to 0.137 + 0.284 equals 0.421.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional