Which of the following is the correct expansion of (y + 1)(y2 + 2y + 3)? y3 + 3y2 + 5y + 3 y3 + y2 + y + 3 y3 + 6y2 + 5y + 9 y3 + 5y2 + 6y + 3

Use distributive property:

(a + b)(c + d) = ac + ad + bc + bd

(y + 1)(y² + 2y + 3) = (y)(y²) + (y)(2y) + (y)(3) + (1)(y²) + (1)(2y) + (1)(3)

= y³ + 2y² + 3y + y² + 2y + 3 = y³ + (2y² + y²) + (3y + 2y) + 3

= y³ + 3y² + 5y + 3

answer:

you would find the difference of the prices and divide the value by the original price, the difference would be 80, 80/400 is 1/5 which is 20%. you could write a set of equations or use the interest formula, where p equals the principal amount. r equals the rate/ percentage of interest, n equals the compounding periods and t equals time. hope this ! : )