4. larry wants to save $87 for tickets to a concert. if he has $23 now and will save $4 per week, how long will it take him to get enough money to buy the tickets?
define the variable.
write and solve an equation to find the number of weeks.
show all of your work!

How to do this , and can some one explain

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.