Tammy has a rectangular rug with an area of 21 square feet. The rug is 4 feet longer than it is wide. Tammy wrote an equation that could be used to solve the width of the rug. Which of the following represents the equation after converting it to standard form? Question 1 options:

w2+4w+21=0

w2+4w−21=0

4w2+4w−21=0

4w2−21=0

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.