Is this an arithmetic sequence 1,1/2,1/4,1/8

No, it is a geometric sequence.

Step-by-step explanation:

The 2nd term is half the first term, the 3rd term is half the second term, etc..

If it were an arithmetic sequence you would need to add or subtract the same difference each term, but here you are multiplying each term by 1/2.

no problobm

step-by-step explanation:

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)