Small circular disks are being cut from thin sheets of steel. The steel weighs 1.6 grams per square centimeter. The disks are to have diameters of 5 centimeters.(a) Find the area of the disk to the nearest hundredth of a square centimeter. (b) How much does a single disk weigh? Round to the nearest gram. PLEASE HELP, I NEED ANSWER IN 10 MINUTES!
(First answer will get brainlist)

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?