book Maths Puzzle Numerical Ability

Can you please answer this question?

-3 multiplied by -9

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book Other Question

How many solutions does a quadratic usually have?

Find the missing value that makes the trinomial a perfect square

x^2+20x+____ & x^2-3/4x+____ A company specializing in magazine sales over the telephone found that in 2500 phone calls, 360 resulted in sales and were made by male callers, and 480 resulted in sales and were