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NeX [460]
3 years ago
14

Solve for k. 15 - 5(4k – 7) = 50

Mathematics
1 answer:
Katyanochek1 [597]3 years ago
8 0

Answer:

15-5(4k-7)=50

<=> 15 - 20k + 35 = 50

<=> 50 - 20k = 50

<=> -20k = 0

<=> k=0

Step-by-step explanation:

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If sin 22.6°=5/13, what is cos 67.4° ?​
lara [203]

The value of cos 67.4° is 5/13.

According to trigonometric identities used in mathematics, sin of an angle is equal to cos of 90 - the given angle. Mathematically, this means that, suppose we have an angle x, then-

sin(90 - x) = cos x

Here, we are given that sin 22.6° = 5/13. As we can observe that (90 - 67.4) is equal to 22.6, and we need to find the value of cos  67.4° only. Thus we can write the given equation as follows-

sin22.6° = sin(90 - 67.4°)

= cos 67.4°

Thus, sin 22.6° = cos 67.4°

Hence, cos 67.4° = 5/13

Thus, the value of cos 67.4° comes out to be 5/13.

Learn more about trigonometric identities here-

brainly.com/question/7331447

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3 0
1 year ago
Solve ln 2 + ln x = 5 . Round to the nearest thousandth, if necessary. show work please
Paraphin [41]

\ln 2 + \ln x = 5\\\\\implies \ln(2x) = 5\\\\\implies 2x = e^5\\\\\implies x = \dfrac{e^5}2 = 74.207

6 0
3 years ago
What is the value of this expression when a=3 and b=-1?
lesya692 [45]

Answer:

1/4

Step-by-step explanation:

(\dfrac{3(3)^{-2}(-1)^6}{2(3)^{-1}(-1)^5})^2=

(\dfrac{\frac{1}{3}}{-\frac{2}{3}})^2=

(-\dfrac{1}{2})^2=

\frac{1}{4}

Hope this helps!

5 0
4 years ago
4x - y = -4<br> 5x = 2y +1<br> how do I solve this using elimination?
julia-pushkina [17]
8x - 2y = -8
-5x + 2y = -1

3x = -9
x = -3
4 0
3 years ago
Read 2 more answers
4, 3, 4, 2, 7 * 1 point Mean: 4 Median: 4 Mode: 4 Range: 5 Mean: 5 Median: 4 Mode: 4 Range: 3 Mean: 20 Median: 4 Mode: no mode R
m_a_m_a [10]

2, 3, 4, 4, 7

Mean: 2 + 3 + 4 + 4 + 7 = 20/5 = 4

Mode: 4

Median: 4 (middle number)

Range: highest value - lowest value = answer

Range: 7 - 2 = 5

Mean: 4

Mode: 4

Median: 4

Range: 5

5 0
3 years ago
Read 2 more answers
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