Which expression is equal to (5−2i)−(1+3i)? 4+3i 4+i 6−5i 4−5i which expression is equal to −2i(−9+6i) ? −12+18i 18−12i 18+12i 12+18i

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

We just started the introduction into circles and i have no idea how to do this.

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!