Evaluate the summation of 20 times 0.5 to the n minus 1 power, from n equals 3 to 12.

The sum of the series is 9.99

Step-by-step explanation:

We are given the series .

So, , where n=3 to 12

Then, we have,

Thus, the common ratio is

Since, the sum of first n terms of a series is .

As n = 3 to 12, then the number of terms = 10, first term=a₃= 5 and r= 0.5

So, the sum of 10 terms is

i.e.

i.e.

i.e.

i.e. S = 9.99

Hence, the sum of the series is 9.99

24

step-by-step explanation:

if it takes 8 pounds to make 12 divide 12 by 8 and you get 1.5, 1.5 x 16 = 24