Urgent
how many 4-letter passords can be made using the letters a thought z
a) repetition of letters is allowed?

b) repetition of letters is not allowed?

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours