Answer:
34 in²
Step-by-step explanation:
Use the formula A = (a + b)(h/2)
Then plug in the numbers
A = (12+5)(4/2)
A = 17(2)
A = 34
Answer:
x + 3y = 21
Step-by-step explanation:

Equation of the line: y =mx+ b

Multiply the equation by 3
3y = -x + 21
x + 3y = 21
Perimeter = 2(l + w)
Thus,
102 = 2(l + w)
l = 6 + 2w
102 = 2( 6 + 2w + w)
102 = 12 + 4w +2 w
102 = 12 + 6w
90 = 6w
Thus, w = 15.
Length = 6 + 2w
= 6 + 30
= 36.
Thus, the length is 36 meters and width is 15 meters.
X=-3
because
-4x=21-9
-4x= 12 divide both sides
x=-3