The answer is 90.
28/2.8 = 10
10 x 9 = 90
X=2 because 3 times 2 is 6 and then you add 6 and 7 together and get 13.
Answer:
The sum of the given series is 1023
Step-by-step explanation:
Geometric series states that a series in which a constant ratio is obtained by multiplying the previous term.
Sum of the geometric series is given by:
where a is the first term and n is the number of term.
Given the series: 
This is a geometric series with common ratio(r) = 2
We have to find the sum of the series for 10th term.
⇒ n = 10 and a = 1
then;

Therefore, the sum of the given series is 1023
C. Chana’s and Josiah’s distance from the starting line at the time when chana catches up to Josiah