Afunction follows the rule y = -75 - 5x. when the function's output is 25, the equation is 25 = -75 - 5x. what is the function input when the output is 25?

The function input is -20 when the output is 25

Step-by-step explanation:

we have

where

y is the dependent variable or output

x is the independent variable or input

If the output is 25

then

y=25

substitute

Solve for the function input is the same that solve for x

Isolate the variable x

Adds 5x both sides

subtract 25 both sides

Divide by 5 both sides

therefore

The function input is -20 when the output is 25

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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