Find the perimeter of a triangle with side lengths of (3c + 4), (5c - 2), and (4c + 7)

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Find dy/dx using implicit differentiation ln(20+e^xy)=y

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.