if mrs. Rios washed 1/4 f her laundry and her son washed 2/5 so Who washed most of the laundry? How much of the laundry still needs to be washed?

7/20 still needs to be washed.

Step-by-step explanation:

You will need to find the lowest common multiple and add the two fractions together and subtract that sum from 1. The 1 represents the total amount of laundry and the sum you will find represents the fraction of laundry that Mrs. Rios and her son have already washed combined.    

1/4 + 2/5

= 5/20 + 8/20

= 13/20

1 - 13/20

= 20/20 - 13/20

= 7/20

(f + g)(x) = x² + 3x + 5

Step-by-step explanation:

There are two different functions f(x) and g(x) with domain the set of all real numbers and given by  

f(x) = 3x + 5 and  

g(x) = x²

Now, we have to find the function (f + g)(x) which is obtained by simple arithmetic addition of the two functions.

Therefore, (f + g)(x) = f(x) + g(x) = (3x + 5) + (x²) = x² + 3x + 5 (Answer)