If f(x) = −2[x]+ 8, what is f(−1.8)?
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If you would like to calculate f(-1.8), you can do this using the following steps:

f(x) = -2 * x + 8
f(-1.8) = -2 * (-1.8) + 8 = 3.6 + 8 = 11.6

The correct result would be 11.6.

These graph is cross the yaxis and x axis two ways.