In order to determine the mean:
Add all of the numbers given and then divide the sum by the total amount of numbers in the equation.
5 + 8 + 4 + 7 = 24
There are 4 numbers, so:
24 / 4 = 6
The average number of books Vasquez reads per month is 6.
The mass of the gold bar is = 13.896 kg.
To acheive this answer you have to multiply the area of the trapezium and the length of the bar. Hope this helped x :)
1.55 i did that math too it was kinda hard but i did it