Make each metric conversion:
300 cm to m
45 m to dk
900 mm to cm
Please help ASAP!!! :(

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

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.

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution