(a) Omar changed 800 rands into dollars when the rate was $1 = 6.25 rands. (i)
How many dollars did Omar receive?

$128

Step-by-step explanation:

If $1=6.25 rands then we must divide 800 by 6.25

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.