Four more than half a number n

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.