About 400,000 people visited an art museum in december. what could be the exact number of people who visited the art museum

From 350,000 to 449,000

Step-by-step explanation:

Here, the given number,

400,000

Since, a number is rounded to 400,000 if it is between 350,000 to 449,000 including 350,000 and 449,000

Because, a number having 3 in hundred thousand place is rounded to 400,000, if the ten thousand digit of the number is 5 or more than 5,

Also, a number having 4 in hundred thousand place is rounded to 400,000, if the ten thousand digit of the number is less than 5,

Hence, the possible exact number of people who visited the art museum would be,

From 350,000 to 449,000

2.   2 3/5.

3.   2 1/2.

step-by-step explanation:

6 - 3 2/5

= 6 -   17/5

= 30/5 - 17/5

= 13/5

= 2 3/5 (answer).

5 1/4 - 2 3/4

= 21/4 - 11/4

= 10/4

= 2 1/2 (answer).

if x decreases by 4 then y increases by 10

step-by-step explanation: