Consider a poisson distribution with an average of 3 customers per minute at the local grocery store. if x = the number of arrivals per minute, find the expected value of x.

Write the fraction or mixed number and the decimal shown by the model

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.