Agood question to use for a scientific investigation should be testable, and it should be connected to science concepts. casey wants to do a scientific investigation about light. which of the following questions would be best to use to guide his scientific investigation?

a) what color of light is the prettiest?
b) which type of light bulb is easiest to catch?
c) which type of light bulb burns the longest?
d) which type of light bulb is preferred by moms?

C) Which type of light bulb burns the longest?

Explanation:The prettiness of light bulb cannot be directly measured. The question "Which type of light bulb is preferred by moms?" and the question about catching light bulbs are not related to scientific concepts about light or light bulbs. The best scientific question is, "Which type of light bulb burns the longest?"

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.