The interior angles of any triangle always sum to 180°.
In the triangle, angles C and D are labeled congruent, so the missing angle has measure
180° - 2 (6x - 5)°
This angle is supplementary to the one labeled (11x + 1)°, which means
180° = (11x + 1)° + (180° - 2 (6x - 5)°)
Solve for x :
180° = (11x + 1)° + 180° - 2 (6x - 5)°
0 = (11x + 1)° - 2 (6x - 5)°
0 = (11x)° + 1° - (12x)° + 10°
(12x - 11x)° = 1° + 10°
x° = 11°
x = 11
6×(1×5)=(6×1)×5
6×5=6×5
30=30
Always do the brackets first.
Follow BEDMAS
B = Brackets
E = Exponent
D = Division
M = multiplication
A = Addition
S = Substruction
Answer:

Option A is the correct option.
Step-by-step explanation:

Use the distributive property to multiply each term of the first binomial by each term of the second binomial
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Collect like terms
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Hope I helped !
Best regards!!
For the first question find circumference
C=pi*d
C=9.5*pi
C=29.84 (B)
For the next do area
A=pi*r*r
A=pi*8*8
A=200.96 (C)
For the next do circumference
C=pi*d
C=pi*13
C=40.82 (D)