Harold made the conjecture that the sum of any two prime numbers is a composite number.
which equation is a counterexample to his conjecture?
a.
17 + 2 = 19
b.
11 + 5 = 16
c.
3 + 10 = 13
d.
4 + 1 = 5

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

How many solutions does the nonlinear system of equations graphed bellow have?

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.