Which of these is correct?

`4/5 xx 3 ＝ 12/15`

`1 - 2/15 ＝ 13/15`

`3/11 + 4/11 ＝ 7/22`

all of these

Which of these is equal to zero?

`0/0`

`0/5`

`5/0`

all of these

1 – 3% ＝

-2

0.7

0.97

0.997

What does a calculator result of 9.713890928E-16 represent?

9.713890928^-16

an extremely large number

a positive number that is approximately zero

a negative number that is approximately zero