Question

2/5+1/9=
1/15
23/45
3/14
19/45

Answer 1

the LCD is 45

Answer 2

After that you need to multiply the numerators by whatever it took to get the denominator

Answer 3

for example to get from 5 to 45 you multiplied by 9 so you need to multiply the numerator 2 by 9. and you also need to multiply 1 by 5 for the other fraction. therefore your answer is
23/45