Factorise fully the following:
a) x2 + 3x
b) 2x² – 8x
3
c) 6x + 9x
d) 12x - 4x2

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

Identify this conic section. x2 - y2 = 16 o line circle ellipse parabola hyperbola

Acheetah can run 70 per hour. what is the speed in feet per hour