Can anyone help me with this. From Malaysia form 4 subject maths . fast response pls. questions 4 and 5

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)