Can anyone help me?
(the options for u are [<-3,-2>, <-3,-1>,<-2,-2>,<-2, -1> the options for v are [<-5,1>,<-4,0>,<0,-4 >,<1,-5> and the options for v - 2u are [<-5,3>,<0,4>,<5,-3& gt;,<4,0>

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²