exam Maths Puzzle Numerical Ability

factorization by spliting the midle term.
8m^4-38m^2n^2-21n^4

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exam Other Question

The following hypotheses is an example of
H0:π ≤.40
Ha:π > .40

a a one tail test for means
b. a two tail test for means
c. A one tail test for proportions
d. a two tail for proportions
e. None of the above A rectangular hole 2cm wide and x cm long is cut in a retangular sheet 3.5cm wide and y cm long. The lentgh of the hole is 1 cm less than the length of the sheet. After the hole is