Write an equivalent expression for 8+7y+2x+4y+4

What is the smallest integer n such that n\sqrt{2} is greater than 20

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).

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much