Question

find the sum of all the digit number which are multiples of 9 on the chapter arithmetic sequence​

Answer 1

Answer:

Answer:To do this, add the two numbers, and divide by 2. Multiply the average by the number of terms in the series. This will give you the sum of the arithmetic sequence. So, the sum of the sequence 10, 15, 20, 25, 30 is 100.