exam Maths Puzzle Numerical Ability

how much would a water bill be per month if
n = 5000c - 15300/4
solve for c
and n = 1800 gallons of quantity

can u help me

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exam Other Question
What is the value of the expression log (2+3)? i need help doing these please.

These are suppose to be open sentences.

[3b-5]=7

[w+5]>1