Calculate the unit rate for each item. round to the nearest cent
a box of 4 light bulbs costs $3.79
a bag of 5 oranges costs $2.19.
a package of 12 bars of soap costs $5.25

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is

Aaron paid $9.75 for markers that cost $0.75 each. he bought 4 times as many pencils for $0.35 each. how much did aaron pay for pencils?