Evaluate.
{3+ [-5 (2 – 4) : 2]} •3

24 so 4th answer

Step-by-step explanation:

Hope this helps

Given info:

Evaluate,

[3 + {-5 (2 - 4) ÷ 2}].3

⇛[3 + {-5(-2) ÷ 3}].3

⇛[3 + {-5 × -2) ÷ 3}].3

Now, see in equation both minus (-) sign will cancel out. Because there is multiplication (×) sign.

Suppose -a × -b = a × b = ab. So that is reason. why minus (-) will cancel out in equation.

⇛[3 + { (5 × 2)÷3}].3

⇛[3 + {10 ÷ 3}].3

⇛[3 + {10 × 1/3}].3

⇛[3 + {10/3}]. 3

⇛3 + {10/3}×3

⇛3 + {10×3}/3

⇛3 + 30/3

⇛3 + 10

⇛13. Ans.

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