Let x be the number of red balloons and y the number of yellow balloons used, then
x + y ≥ 40
y ≥ 25
Answer:
Zero-elevation surface is a vertical datum that is used to describe a surface, such as that of a planet. The value of this datum is usually adopted by statute. This elevation is used, for example, to build a texture map from an agreed surface, such as a spheroid with dimensions defined by a mean surface gravity.
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56 is the answer so it's A, C and E.
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