Question

Please help, -3xyz for x = -3/4 , y = 5/9 and z = -8/15

Answer 1

Its evaluate

Answer 2

Replace the variable with the numbers they're equal to
\[-3\left(- \frac{ 3 }{ 4 } \right)\left( \frac{ 5 }{ 9 } \right)\left(- \frac{ 8 }{ 15 } \right)\]
You can write 3 as 3/1 if it makes it easier
\[\left(- \frac{ 3 }{ 1 } \right)\left(- \frac{ 3 }{ 4 } \right)\left( \frac{ 5 }{ 9 } \right)\left(- \frac{ 8 }{ 15 } \right)\]

From here, you can cancel common factors and then multiply.
Or multiply and then reduce at the end

Answer 3

I did that, but my teacher was like no.

Answer 4

- 9 / 4?