19) Jason received an Amazon gift card for his birthday. After he buys a song, the card's value is $17.21. After he purchases a second song, the card is worth $14.42. Jason downloads one more song and has $11.63 left on the card. i) Write an equation to define a as the amount of money left on the gift card after n purchases. ii) Jason plans to download a song every Tuesday moming. How many weeks in a row can he buy a song before the gift card runs out?​

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?