In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10oC/s had an average Rockwell (B) hardness of 91.1 and a standard deviation of 6.44, and 40 welds cooled at a rate of 30oC/s had an average hardness of 90.7 and a standard deviation of 4.18. Ten more welds will be made in order to increase the precision of the confidence interval. Which would increase the precision the most, cooling all 10 welds at the rate of 10oC/s, cooling all 10 welds at the rate of 30oC/s, or cooling 5 welds at 10oC/s and 5 at 30oC/s? Explain.

Find the area of an equilateral triangle with a side of 6 inches

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Urgent! 20 points! here is a you are the new manager at trusty goods wholesale produce. you need to figure out how to adjust the amount of produce in your notes after the events of the day: you got 5 more crates of bananas someone returned 2 crates of apples a worker dropped a crate of grapes (oh no! , you had to throw them out) you sold a crate of bananas you sold 5 crates of apples can you write an expression to describe your day using: "a" for crates of apples "b" for crates of bananas and "g" for crates of grapes? make sure the expression is in simplest form question 2 (3 points) explain your steps using sentences.