The yield of a chemical process is being studied. from previous experience, yield is known to be normally distributed and σ=3. the past five days of plant operation have resulted in the following yields 91.6, 88.75, 90.8, 89.67, and 91.7. find a 95% two-sided confidence interval on the true mean yield. (a) calculate the sample mean. round your answer to 2 decimal places.

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Guys i need ! graded assignment grade 8 checkpoint 2, part 2 answer the questions below. when you are finished, submit this assignment to your teacher by the due date for full credit. total score: of 9 points (score for question 1: of 4 points) 1. the cost of renting a car for a day is $0.50 per mile plus a $15 flat fee. (a) write an equation to represent this relationship. let x be the number of miles driven and y be the total cost for the day. (b) what does the graph of this equation form on a coordinate plane? explain. (c) what is the slope and the y-intercept of the graph of the relationship? explain.

Which number line correctly shows 0.8 + 0.3?