book Maths Puzzle Numerical Ability

Find the numberof possible 5-card hands that contain the cards specified.
5 face cards

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book Other Question

Express the following as single logarithms, and if possible, simplify

a. Ln2x+3(Lnx-Lny)

b. 2/3[Ln(x^2-9)-Ln(x+3)]+Ln(x+y)

Convert to logarithmic notation:

x^3=-81 I need help on this one! Please!!! Use the quadratic formula to solve
2x^2+x-5=0