Which expression represents the product of X to the third power plus 2X -1 and X to the fourth power minus X to the third power +3

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

Ithink it may be 10^3,that mean 10 'exponent ^3 would the population scientific in terms to evaluate by such and