Peter went upstream in a canoe at an average speed of 12 miles per hour. he returned by the same route at an average speed of 18 miles per hour. what was peter's average speed for the round trip, in miles per hour?

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.

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.

Which is these sentences can be deleted from the first paragraph sentence 4 sentence 2 sentence 5 sentence 3