Which option below best describes the difference between an experiment and an observational study? The groups in an observational are chosen at random, but not in an experiment. The values in an observational study are chosen at random, but not in an experiment. The groups in an experiment are chosen at random, but not in an observational study. The values in an experiment are chosen at random, but not in an observational study.

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

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)

english maybe i can ..

it's possible to build a triangle with side lengths of 3, 3, and 9.- true ( b.)