If a store sells pencils at 12 for $1.09, how many pencils can you buy for $3.50? THIS IS A PROPORTIONS QUESTION
12 pencils = $1.09
x pencils = $3.50
So 1.09 times what is equal to 3.50
HOPE IT MAKES SENCE!!

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?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).