Which equation below represents a proportional relationship? a. y = 5x – 9

b. y = 2x + 7

c. y = 8x

d. y = 3x – 2

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

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

Plz ( true - false) all triangles have interior angles whose measure sum to 90.