The number of red blood cells per square unit visible under a microscope follows a Poisson distribution with mean 4. Find the probability that more than 5 such blood cells are visible to the observer. What is the standard deviation of the number of red blood cells per square unit?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Yuto and hila attempted to solve the same inequality. their work is shown below. which statement is true about the work shown above? yuto is correct because he isolated the variable correctly and reversed the inequality symbol. yuto is incorrect because he should not have reversed the inequality symbol. hila is correct because she isolated the variable correctly and reversed the inequality symbol. hila is incorrect because she should not have reversed the inequality symbol.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?