exam Maths Puzzle Numerical Ability

Could someone please help me with these problems?

Solve the following equations. Round to 4 decimal places when necessary.

a. Log3 x=8

b. 27^2x+2=81^x-3

c. log2 (3x+2)=

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exam Other Question

Verify that (-1,3) is a solution to y=(-1/2)x+(5/2)
Could you also please show how you got it.
Thank you
At Gwen's grage sale, all books were one price, and all magazines were another price. Harriet bought four books and three magazines for $1.45, and June bought two books and five ma