exam Maths Puzzle Numerical Ability

is the following trinomial a perfect square?

x^2+18x+81

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exam Other Question

How do I solve using a system of equations in two variables?

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers i 21. Find the numbers.
Match the expression with the correct answer. You may use each answer more than once.
A. ln e
-b. ln 1
c. log 10
d. e^0


A. 0
B. 1
C. none of the above