The price of a pair of shoes is $45.90. the sales-tax rate is 5 percent. how much sales tax do you need to pay?
a)0.30 b)2.30 c)23 d)48.20

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

I'm confused on this could anyone me and show me what i need to do to solve it.

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=