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kolezko [41]
2 years ago
15

Tell whether the angles are complementary or supplementary. Then find the value of x

Mathematics
2 answers:
lara31 [8.8K]2 years ago
8 0

Answer:

Complementary, x is 78

Step-by-step explanation:

Let's first define what complementary and supplementary angles are. Complementary angles add up to 90 degrees, and supplementary add up to 180. From this image, we can see that this is a right angle. Right angles add up to 90 degrees, therefore, this is a complementary angle.

Now, because we know that it is 90 degrees and that (x-8)+(20) = 90, then we can solve for x. However, if the angle is unknown, then we would do x-8=20. In this case, sense we know for sure this angle is complementary, we do

(x-8)+(20) = 90

X+12=90 We combined like terms

X=78 Inverse operations

You can plug 78 into x and check to see if it is correct if they are 90 degrees total.

luda_lava [24]2 years ago
3 0

Answer:

Complementary, x=78

Step-by-step explanation:

90= (x-8)+20

complementary angles add up to 90 degrees.

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QUESTION 1 (ONLY ANSWER FOR ALL QUESTIONS) a) 2x/3 =8 (what is x=?) b)3x/2 =6 (what is x=?) QUESTION 2 a)x/3 -2 =6 (what is x=?)
Alex777 [14]

Answer:

1 (a) x = 12

1 (b) x = 4

2 (a) x = 24

2 (b) x = 20

3 (a) x = 4

3 (b) x = 17.5

Step-by-step explanation:

1 (a)

2x/3 = 8

2x = 8 × 3

2x = 24

x = 24 ÷ 2

x = 12

1 (b)

3x/2 = 6

3x = 6 × 2

3x = 12

x = 12 ÷ 3

x = 4

2 (a)

x/3 - 2 = 6

x/3 = 6 + 2

x/3 = 8

x = 8 × 3

x = 24

2 (b)

x/5 + 1 = 5

x/5 = 5 - 1

x/5 = 4

x = 4 × 5

x = 20

3 (a)

5x/2 + 1 = 11

5x/2 = 11 - 1

5x/2 = 10

5x = 10 × 2

5x = 20

x = 20 ÷ 5

x = 4

3 (b)

2x/7 - 3 = 2

2x/7 = 2 + 3

2x/7 = 5

2x = 5 × 7

2x = 35

x = 35 ÷ 2

x = 17.5

5 0
3 years ago
For a set of five whole numbers, the mean is 4, the mode is 1, and the median is 5. What are the five numbers? Plz help me plz
solniwko [45]
Mean is the average, mode is the number that is repeated most often and the median is the middle number.  We know there are 5 numbers so, 5 is the middle as it is the median #. The mode has to appear more than once or 5 would also be a mode.
1 1 5 _ _  
M = 1+1+5+x+y /5
4 = 1+1+5+x+y/ 5
4 = 7+x+y / 5
Average of 5 numbers is 4 therefore 4 times 5 = 20
20-7 = 13, what two numbers that are more than 5 equal 13?  Only 6 &7.
4 = 1+1+5+6+7 / 5
3 0
3 years ago
can someone please help? I put random numbers for the first 2 but I need help with the last one - i’ll give brainliest
stealth61 [152]

Answer:

(x+x)^2=4-x

Step-by-step explanation:

I think, don't be mad if I'm wrong!

8 0
2 years ago
Read 2 more answers
I realllllly need help thankyou
kondaur [170]

Answer: The two correct answers would be 40 and 45.


Step-by-step explanation: The square root of 40 is 6.32 which is between our given values 6 and 7 it also can be represented as 2 sq rt 10 The sq rt of the second number 45 is 6.70 which is again between the 2 values. It can also be represented as 3 sq rt 5. Hope this helps!


6 0
3 years ago
If cos x= sin(20 + x)° and 0° < x < 90°, what is the value of x
ZanzabumX [31]

If cos x= sin(20 + x)° and 0° < x < 90° then value of x is 35 degrees

<em><u>Solution:</u></em>

Given that:

cos x= sin (20 + x)

We know that,

sin (a+b)=sin a \times cos b+cos a \times sin b

cos x= sin (20 + x) = sin 20 cos x + cos 20 sin x

cos x-sin20 \times cos x=cos 20 \times sin x

Taking cos x as common,

cos x(1-sin 20)=cos 20 \times sin x

\frac{(1-sin 20)}{(cos 20)}=\frac{sin x}{cos x }\\\\tan x = \frac{(1-sin 20)}{(cos 20)}

By trignometric functions,

sin 20 = 0.34202

cos 20 = 0.939692

So,

tan x = \frac{1 - 0.34202}{0.939692}\\\\tan x = 0.7002

Therefore,

x = arc tan (0.7002)

x = 35 degrees

Therefore value of x is 35 degrees

<h3><u>Method 2:</u></h3>

cos x = sin (20 + x)

sin and cos are co - functions, which means that:

cos x = cos [90 - (20 + x)]

cos x = cos (90 - 20 - x)

cos x = cos (70 - x)

Therefore, x = 70 - x

x + x = 70

2x = 70

x = 35

Therefore value of x is 35 degrees

3 0
3 years ago
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