Perry can harvest a field in 14 hours. Eduardo can harvest the same field in 19 hours/ Find how long it would take them if they worked together.

7.44 hours??? (not too sure)

Explanation: Perry harvests 1/14 of a field in an hour and Eduardo harvests 1/19 of a field. 1/14 + 1/19 = 33/266 then you multiply by an hour

(14/19) / 2 = 16.5 hours

(This applies if both fields are in)

if you wanted to find out 1 field if they worked together it would be 8.25 hours

Verified by dad

We can observe physical properties of elements and compounds without changing the substance.

Examples of physical properties: Density, color, boiling point, state of matter, appearance: dull or shiny, etc. 

But we can also observe and measure chemical properties by reacting a substance with something else. For example, like mixing baking soda and vinegar together. The vinegar reacts with the baking soda and produces carbon dioxide: a new substance. 

Some examples of chemical properties: Flammability, amount of heat that is released during combustion, toxicity (how much damage it causes to other organisms), radioactivity, and ability to oxidize (when you have metal that becomes rusty looking).