exam Maths Puzzle Numerical Ability

The average of two four digit positive integers is found by placing a demimal point between the two numbers. Find the sum of the two four digit numbers.

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d...ch4

# 44
solve: x^2=-6x

#55
Use the ac test to determine if the following trinomial can be factored.
x^2+2x+3.Explain your answer.

#16
State which method should b The sum of two numbers is 39 and their difference is 7. What are the numbers?