How to add fractions? for example: 1/3 + 2/5

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Add the fractions and simplify 1/2+ 1/3

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25