Which function is a quadratic function? c(x) = 6x + 3x3 d(x) = x – 8x4 p(x) = –5x – x2 k(x) = 2x2 + 9x4
2 answers:
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The pythagorean theorem is . And since 2 and 5 are legs while c variable is the hypotenuse, the equation would be
, or the first option.
1) 
.
2)
.
3) The particle is moving right when the velocity function is positive:
or 
.
4) When
the particle is slowing down because the acceleration is close to zero 
the particle is speeding up when acceleration is increasing away from zero: 
.
5)
.
2)
3) The particle is moving right when the velocity function is positive:
4) When
5)