Kirsten has 25 coins. in her collection she has dimes and quarters. if the total is $4.00. how many dimes and how many quarters does she have?

write a system of equations to express this situation. let d = the number of dimes and let q = the number of quarters.

solve the system of equations to determine the number of dimes and the number of quarters.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

The krasnapolski is a top-of-the-line hotel in amsterdam, the netherlands. among their many services, they rent bicycles to guests. the bicycle checkout is open 24 hours per day 7 days per week and has 50 bicycles on hand. on average, 10 guests request a bicycle each day, arriving completely randomly at all times of the day during the spring and summer seasons. guests keep bicycles for four days on average, with a standard deviation of two days. how long does a guest on average have to wait for a bike? a. approximately 24 hours b. approximately 0.033 hours c. approximately 4 days d. approximately 47 minutes