Describe the pattern. that does not make sense to me at all

The pattern is multiplying by 2

Step-by-step explanation:

.41, .82,1.64,3.28,

Take the second term and divide by the first term

.82/.41 = 2

Take the third term  and divide by the second term

1.64/.82 = 2

Take the fourth term and divide by the third term

3.28/1.64 = 2

We are multiplying by 2 to get from the first to the second term, the second to the third term, the third to the fourth  term.  

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70