Feeling dum today please help

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Which of the following values are in the range of the function graphed below? check all that apply ! - will give the answer "brainliest! "

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?