What's the formula used to find the area of a pentagon

What are the values of m∠abc, m∠cbf, m∠abd and m∠dbe in the given figure? explain or show your work?

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?