Suma divizorilor naturali ai numărului 15

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3