The first equation of the system is multiplied by 4. By what number would you multiply the second equation to eliminate the y variable by adding? 2x + 5y = 16
8x – 4y = 10

a -5

b 5

c -2

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

Which of the following expressions are equivalent ?

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x