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3, and b

Step-by-step explanation:

1. x =3

Because you have 3 little squares for one x

2. x= -12

b) 15+6=21

1. A.3

2. B.

Step-by-step explanation:

B 1/2=.5

Step 1: 0.5*12=6

Step 2: 15+6=21

A.

Because the rectangle = 3 squares so just add them up and you get your answer.

step-by-step explanation:

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)