Anumber increases by 50%, and then decreases by 50%. what is the percent of change from the original number to the final number? is it an increase or a decrease?

The percent change will be a 25% decrease

Step-by-step explanation:

In order to find this, we can first call the original positive number a. Now to find how much it would be when we add 50% of that, we can create the following equation.

a + .5a = 1.5a

Now we need to take 50% of that result. To do that, we can multiply by .5.

1.5a * .5 = .75a

Since the end result of the adding and subtracting 50% is .75a, we know that it is just 75% of the original number.

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.