Mrs. frawley bought 15 tickets to the park for her class and 15 meal vouchers that cost $5.45 each. what was the total amount of money she spent if she had a $12.50 off coupon? show all work.

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).

X+y=-4 x-y=2 use elimination with adding and subtraction

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years