Cracks and rocks description and location. this question is for science

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

Lines of longitude are like stripes from the top of the globe down to the bottom virtually slicing the earth like an orange

In the diagram, δgef and δhef are congruent. what is the value of x?