2a+3b=5 b=a-5 what’s the answer

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

Here is my question! jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?