exam Maths Puzzle Numerical Ability

Add or subtract Express the result in simplest form

_2_ - 3
5w+10 2w-4

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exam Other Question

An investment of $5000 is made at an annual simple interest rate of 5.3%. How much additional money must be invested at an annual simple interest rate of 8.5% so that the total interest earned is 6.5% of the total investment?
Given: RS=ST .---------.---------.
Prove: RT=2ST R S T

What are the Statements and Reasons for this proof?</PRE>