19. Five yards of fabric and three spools of thread cost $40.12. Two yards of the same fabric and ten spools of the same thread cost $23.88. Find the
cost of a yard of fabric and the cost of a spool of thread.
Fabric: ?
Thread: ?

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

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

I’m stuck on this equation, anyone got the answer?