PLEASE I NEED HELP YOU"LL GET 30 PTS IF YOU ANSWER In the year 2005, the average cost of a car would be modeled by the equation C = -15x² +20x - 3 where x is the number of years since 2005. By the year 2010 the average cost had changed, and the equation can be modeled C = -10x² + 30x - 2. Find the difference in average cost equation for cars between 2005 and 2010.

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Which graph represents the equation y =4x

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.