The cost of a classified ad is based on a daily rate plus a flat service fee. one day cost $3.50 and four days cost $800 write and solve a linear equation to find the cost of a 7-day ad.

Apool measures 100 meters by 100 meters a toddler inside the pool and trows a ball 60 centimeters from one edge of the pool.how far is the ball from the opposite edge of the pool

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.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?