Ok ok, Jonathan is making his favorite pasta dish. His mom ate 2/7 of the pasta, and his brother ate 1/6 of the pasta. How much did they eat in all?

It is 0.4524 rounded simply you can say 0.45

Step-by-step explanation:

if you multiply 2/7 by 6 which is 12/42 and 1/6 times 7 which is 7/42 and add both fractions you will get 19/42 which is 0.45 you can either say the answer is 0.45 or 19/42.

19/42

Step-by-step explanation:

The first thing you need to know is that we are adding because it says "How much did they eat in all?" Then, need to write down the common denominator of both 7 an 6. That is, 42. Now you have, 2/7+1/6= ?/42. Now you need to find out what the value of the numerator. We have to multiply 2 and 6 together, we will get 12. Then we got to do the same thing with 1x7, that will be 7.

12+7=19

Remember ?/42 --- that will be now 19/42

19/42 can not be further simplified.  

b. astronomers