Hi, to whoever sees this question please answer it with a real answer. Loads of people just answer questions with a question or useless info just to get the points. I will be offering 50 points for this question, please help! (Also for those who go to RSM you might recognize these problems or know how to solve them, for those of you who don’t go there, please still try and help)

Express these as a sum
a) a-5
b)4.5-8.3-2
c)1-a-b-c
And please express these as a difference
a)a+5
b)m+n

Give an example of the type and scale of economic activity for a traditional economy.

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.

Spider crabs live in the shallow regions of the ocean floor. algae tend to grow on the surface of spider crabs. the algae provide the crabs protection from predators by camouflaging them. the spider crabs give the algae shelter. what does this description suggest? 1. the algae are parasites of the spider crabs. 2. the algae and the spider crabs have a mutualistic relationship. 3. the spider crabs are commensals, and the algae are parasites. 4. the spider crabs benefit from the algae living on them. 5. the spider crabs are parasites of the algae.