a rifle is aimed horizontally at a target 100m away. if the bullet strikes 10 cm below the centre what is the velocity of the bullet

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Explanation:

Different bullets travel at different speeds, also it depends on the rifle. Different rifles barrels also cause the bullet to travel either faster or slower.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form