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scoray [572]
3 years ago
13

Is this correct for number 3.

Mathematics
1 answer:
pashok25 [27]3 years ago
7 0
The answer would be correct. hope that helped
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I just took a screenshot of it, but I have no idea how to do this
Marianna [84]

Answer:

84°

Step-by-step explanation:

Solve for n. Note that the angle measurements of a circle will equal 360°. Set all the angles = 360°.

7n + 12 + 13n - 16 + 6n = 360

Combine like terms:

(7n + 13n + 6n) + (12 - 16) = 360

26n - 4 = 360

Isolate the variable, n. Note the equal sign, what you do to one side, you do to the other. First, add 4 to both sides:

26n -4 (+4) = 360 (+4)

26n = 360 + 4

26n = 364

Next, divide 26 from both sides:

(26n)/26 = (364)/26

n = 364/26

n = 14

Next, plug in 14 for n in the angle measurement, 6n:

6n = 6(14) = 84°

Note that these are central angles, which means that the arc's will be the same measurement as the angle's measurement.

arcBC = 84°

84° is your answer.

~

3 0
3 years ago
Classify the triangle with angles measuring 1130, 47°, and 20°.
nydimaria [60]

Answer:

<em>D. Obtuse</em>

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Solve the inequality. 9 + 9(x + 7) &gt;= 36 The solution is
Alchen [17]

Answer:

x≥ -4

Step-by-step explanation:

9 + 9(x + 7)≥ 36

Subtract 9 from each side

9 -9+ 9(x + 7) ≥ 36-9

9(x + 7) ≥ 27

Divide each side by 9

9/9(x + 7) ≥ 27/9

x+7≥ 3

Subtract 7 from each side

x+7-7 ≥ 3-7

x≥ -4

6 0
3 years ago
Read 2 more answers
Calculate the area of the parallelogram, giving your answer correct to 3 significant figures.
Oliga [24]

Answer:

114 units²

Step-by-step explanation:

The opposite sides of a parallelogram are congruent, so

AB = CD , that is

13x - 7 = 5x + 9 ( subtract 5x from both sides )

8x - 7 = 9 ( add 7 to both sides )

8x = 16 ( divide both sides by 8 )

x = 2

Then

5x + 9 = 5(2) + 9 = 10 + 9 = 19

3x = 3(2) = 6

The area (A) of a parallelogram is calculated as

A = bh ( b is the base and h the perpendicular height ), thus

A = 19 × 6 = 114 units²

5 0
3 years ago
A company wanted to estimate the mean lifetime of its new model of lightbulbs. They use a method for testing bulbs that accelera
telo118 [61]

Answer:

13.4±2.132(1.02/5)

Step-by-step explanation:

Khan Academy

6 0
3 years ago
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