1.) The Teacher Retirement System promises a 2.2% return on investment. If teacher invest $2,400 in their first year of teaching, how much money
will that become 30 years later?
A.) $3,986.56
B.) $4,610.39
C.) $5,892.12
D.) 57,926.56

Astudent simplified a rational expression as shown.

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?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?