Round the following off as indicated 1 863 to the nearest 100
2 13 to the nearest 10
3 673 to the nearest 5
4 56,095 to the nearest wholenumber
5 123 , 18kg to the nearest kg
6 R87 , 92 to the nearest rand
7 509 , 798 to two decimal places
8 84 , 1269 to one Decimal place
9 2 , 49759 to three decimal places
10 1449 to the nearest 100​

Can someone me i’m confused. will give brainliest and a whole bunch of points

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

How are sas and sss used to show that two triangles are congruent?