Answer:
B. 66
Step-by-step explanation:
Substitute x = 3
Multiply in the parentheses
(6 + 192) Add
(198) Multiply
66
Answer:
12cm
Step-by-step explanation:
1. Define the variable:
x = length of the rectangle
2x = width of the rectangle
2. Set the equation:
x + 2x is half of the rectangle
2(x + 2x) is the perimeter
So,
2(x + 2x) = 36
2x + 4x = 36
6x = 36
x = 6
Since x is the length, multiply it by 2 to find the width.
2x = 12
Answer:
<em>102°</em>
Step-by-step explanation:
(3x - 12)° + (2x + 2)° = 180°
5x - 10 = 180 ⇒ x = 38
m∠A = (3x - 12)°
<em>m∠A</em> = (3×38 - 12)° = <em>102°</em>
Answer:
7.58
Step-by-step explanation:
Answer:
x = 30
Step-by-step explanation:
Since the triangles are congruent then corresponding angles are congruent.
∠ B ≅ ∠ E
The sum of the 3 angles in Δ CDE = 180°, thus
∠ E = 180° - (55 + 65)° = 180° - 120° = 60°
Thus
2x = 60 ( divide both sides by 2 )
x = 30