Can anyone answer this question for me its on my final exam. the question is, the line y=2x-4 is dilated by a scale factor of 2 and centered at the origin. which equation represents the image of the line after the dilation.
a) y=2x-8
b) y=2x-2
c) y=4x-4
d) y=4x-8

Need to increase the numbers of customers i talk to daily by 20% how many customers do i need to talk to if i talk to a average of 8 customers per hour during an 8 hour shift

How to do this , and can some one explain

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