Question

maths maths matha math's math's​

Answer 1

Answer:

b

Step-by-step explanation:

As,

5 is added in the first step

10 is added in the second step

20 is added in the third step

40 will be added in the last step

Answer 2

Answer:

78

Step-by-step explanation:

It is doubling addition

1. 3 + 5 = 8
2. 8 + 10 = 18
3. 18 + 20 = 38
4. 38 + 40 = 78