The graph shows a normal distribution with a standard deviation of 10. Which percentage is the best estimate for the shaded area under the normal curve?
A. 42%
B. 77.5%
C. 79%
D. 83.5%

What value of x is in the solution set of –5x – 15 > 10 + 20x?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years