What is 3.4 rounded to the nearest whole number?

3

Step-by-step explanation:

3.4 rounded to the nearest whole number would be 3 because the tenths place is under .5 therefore it would be rounded to 3 instead of 4.

If it was 3.5 or higher it would be rounded to 4 because it is .5 or higher.

hope this helps!!

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).

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225