Determine which system below will produce infinitely many solutions.

a) −6x + 3y = 18
4x − 3y = 6

b)2x + 4y = 24
6x + 12y = 36

c)3x − y = 14
−9x + 3y = −42

d) 5x + 2y = 13
−x + 4y = −6

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

What are the solutions of the equation? z^2 + 11z + 24 = 0 a. 8, -3 b. 8, 3 c. -8, -3 d. -8, 3

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.