The lifetime of a certain resistor in a certain application has a mean of 900 hours and a standard deviation of 30 hours. Four resistors are used in sequence (i. e., one after the other), and the total length of time that the four resistors last is recorded. The resistors are independent of one another. What is the mean length of time in hours that the four resistors last?

Started: jun 20 at 10: 35pm quiz instructions question 3 y 2x+4 graph the system of linear inequalities 1 by < 2x-2 ty

Find x to the nearest hundredth place

The label on the car's antifreeze container claims to protect the car between ? 40°c and 125°c. to convert celsius temperature to fahrenheit temperature, the formula is c = 5 over 9 (f ? 32). write and solve the inequality to determine the fahrenheit temperature range at which this antifreeze protects the car. ? 40 > 5 over 9 (f ? 32) > 125; ? 40 > f > 257 ? 40 < 5 over 9 (f ? 32) < 125; ? 40 < f < 257 ? 40 < 5 over 9 (f ? 32); ? 40 < f 5 over 9 (f ? 32) < 125; f < 257