Aquadrilateral has three angles that measure 90 100 and 120 which is the measurement of the fourth angle

Can someone me i’m confused. will give brainliest and a whole bunch of points

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.