exam Maths Puzzle Numerical Ability

write as a single logarithm
2loga (5x^3)- loga (2x+3)

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exam Other Question

For what value of E does the point (1, 2, -1) sit on the curved surface governed by S(x, y) = x^2 - 3y^2 + 4x - Ey + 6?

a. -1
b. 0
c. 1
d. 3� Hi! Could someone please help me to simplify (all exponents should be positive)

4x^3*(3y)^4

and

(2^-1a^2b)^-3
----------------
4a^-9

Thanks so much for the help!