Please help me or no my parents is going to kill me with argument

Hi there!

Question 1: Since they already did the first step for you, the reason why (-6)(-3) is a positive number is because a negative multiply by a negative equals a positive. Plus the (-6)(-3) comes out to be 18.

Question 2: The reason why his answer is incorrect is because he said (-3)(-5) = (-15) which is completely wrong, remember a negative multiplied by another negative must equal a positive. So the next step should be (15)(-2) which then equals to the correct -30.

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