15. jelani is in a walking race at his school. in the first 20 seconds, he
walks 60 meters. in the next 30 seconds, he walks 60 meters. in the
next 10 seconds, he walks 35 meters. in the last 40 seconds, he walks
80 meters.
a. describe how jelani's walking rate changes during the race.
b. what would a graph of jelani's walking race look like?

answer4 to the second power is 16

and 4 to the third power is 64,

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)