I will upvote and give brainliest answer

x = 21°

Step-by-step explanation:

105°+54°=159°

180°-159°=21°

Angle BCA=Angle x

So angle x is 21°

x = 21

Step-by-step explanation:

Angle B (54 degrees) and Angle DAB are alternate interior angles, meaning that they are congruent. So since Angle B is 54 degrees, Angle DAB is also 54 degrees.

So to find x, add 105 and 54 together:

105 + 54 = 159

Then, subtract 159 from 180 (because a straight line will always be 180):

180 - 159 = 21

So, x = 21 degrees.

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)