PLEASE HELP Element X decays radioactively with a half life of 7 minutes. If there are 150 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 3 grams?

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.