Stephen had his scooter repaired for a total of $90. the cost for the parts was $25. the cost for the labor was $15 an hour. if h represents the number of hours, which of the following shows an equality between two different ways of expressing the total cost of stephen's scooter repairs?
a. 40h = 90
b. 15 + 25h = 90
c. 90 + 25h = 15
d. 15h + 25 = 90

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

Write the fraction or mixed number and the decimal shown by the model

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.