swimming, every 3rd day : 3,6,9,12,15,18,21,24,27,30
band practice, every 4th day : 4,8,12,16,20,24,28
Both band practice and swimming : 12th day, 24th dayso 2 days
The answer is 2 days.
We have been given:
After January 1 Aleta has band practice every 4th day and swimming lesson every 3rd day.
We will find the least common multiple of 3 and 4.
This is 12.
This means every 12th day Aleta will have both band practice swimming lessons.
In January, there are 31 days, so there will be 2 times when she will have both lessons, like on 12th and then on 24th.
Therefore, for 2 days in January, Aleta will have both band practice swimming lessons .
answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.
since we have given that
total annual rainfall a city record = 40 inches
this year, total rainfall recorded = 37.6 inches
number of inches of rainfall is needed to match the record of 40 inches is given by
hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.
set up the formula for standard deviation for this set of numbers, then simplify