Question

Help with these please

Answer 1

A.
$1.89 \div( 2 \times \frac{1}{4} )$
b.
$weight \: per \:cm = \frac{9}{15} = 0.6$
e.
Let the number be x
$\frac{75}{85} = \frac{x}{200}$
Others I am not really sure.