The Formula C = 20W shows how much the cost, C, of sending a letter by first-class mail depends on the weight of the letter, W. (C is measured in cents and W is measured in ounces). So you consider C a function of W and write C(W) = 20W. Find C(2) , C(3), and C(4). What is the domain of C? PLEAZ HELP I WILL PICK BRAINLIEST

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.