exam Maths Puzzle Numerical Ability

find the length x in the following triangle

express it in simplified radical form

the left side is 12 the right side is x and the bottom is 8

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exam Other Question

The commutative property of multiplication states: For any real numbers x and y, (x)(y) = _____ A paired difference test is being conducted involving 19 pairs of observations. What is the number of degrees of freedom for the test statistic?
a. 18
b. 19
c. 37
d. 38