1.)AM 630 is a station where you can listen to sports. The frequency is 630 khz(or 630,000hz). What is the wavelength?? 2.) A popular radio station, NPR, transmits a signal that is has a wavelength of 3.38m. What is the frequency of this signal?? Remember that speed of light is 299,792,458 m.

Explanation:

(1) The given equation is :

2(x + 3)=5x + 6 - 3x

Solving LHS first.

2(x + 3) = 2x +6

Solving RHS

5x + 6 - 3x  = 2x+6

LHS = RHS

So, it is always true.

(2) The given equation is :

x - 3=2x - 3 - x

LHS = x - 3

Solving RHS

2x - 3 - x = x-3

LHS = RHS

So, it is always true.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.