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What could be the first step in solving the equation 13x² + 9 = 45?

A. Add 9 to both sides of the equation.
B. Multiply both sides of the equation by 13.
C. Subtract 9 from both sides of the equation.
D. Take the square root of both sides of the equation.

c subtract 9 from both sides of the equation

Step-by-step explanation:

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1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours