Need help with #23 and #24 please!

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

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days