Three positive numbers are in arithmetic progression (a. p). the sum of the squares of the three numbers is 155. while the sum of the numbers is 21. if the common difference is positive. find the values of x and y

The required arithmetic sequence will be 5, 7, and 9 if the sum of the squares of the three numbers is 155. while the sum of the numbers is 21

Let the three positive numbers be a-d, a and a + d

If the sum of the numbers is 21, this means that a-d+a+a+d = 21

3a -d + d = 21

3a = 21

a = 21/3

a = 7

The sequence of numbers will be 7-d, 7 and 7+d

If the squares of the three numbers is 155, hence;

Hence the required arithmetic sequence will be 5, 7 and 9

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step-by-step explanation:

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies