Graph h(x) = 7cos(1/2x)+1 .

use 3.14 for π .

Here's a graph of the first one : https://www.desmos.com/calculator/oqouuljrdk

Second one : The graph at the top left is the correct one

Third one : f(x) = 10cos [ (pi/2) x ] + 10 is correct

Last one : f(x) = 9 sin ( 6pi x) + 3 is correct