paul has a mix of quarters and dimes in his piggybank. he has twice as many dimes than he has quarters. he counts all his coins and notices that he has $\$9.00$ in total. how many quarters does paul have?

Need will give 100 ! in no less than one hundred fifty words, explain why it is important for engineers to sketch designs and use them to clarify their designs to other people, giving at least three reasons.