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n200080 [17]
2 years ago
7

Help I need help I don’t understand

Mathematics
1 answer:
goblinko [34]2 years ago
8 0

Answer:

a) 0

b)2

Step-by-step explanation:

a) Basically, the question is asking what the x value is when the y value is at 4, which would be 0.

b) Same thing here, but with the x value is when the y value is -2.

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Using the Law of Cosines, in triangle DEF, if e=18yd, d=10yd, f=22yd, find measurement of angle D
Ivahew [28]
Check the picture below.

\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}=cos(C)\implies cos^{-1}\left(\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}\right)=\measuredangle C\\\\
-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
f=22
\end{cases}\implies cos^{-1}\left(\cfrac{{{ 18}}^2+{{ 22}}^2-10^2}{2(18)(22)}\right)=\measuredangle D

\bf \implies cos^{-1}\left(0.893\overline{93}\right)=\measuredangle D\implies 26.63^o\approx \measuredangle D

7 0
3 years ago
Find the area of the shaded region.
andriy [413]
8x5 = 40
3x2 = 6

40 - 6 = 34

answer:
area of shaded = 34
3 0
3 years ago
Read 2 more answers
Kevin spent 10 hours doing homework last week. This week he spent 15 hours doing homework. He says that he spent 150% more time
agasfer [191]
No he is wrong because 75% more time would be spent doing homework
6 0
3 years ago
Brainliest to the correct answer :)
Sauron [17]

Answer and Explanation: The answer is in the 1st image, and the explanation is in the 2nd image.

6 0
2 years ago
What is the correct description for the graph of the inequality, y < 42 – 3?
Varvara68 [4.7K]
Answer: The graph is a solid line. The test point (0,0) does not satisfy the inequality.


Explanation:
The line is solid because it is less than or EQUAL TO. The test point does not satisfy because if you replace y and x with 0, it will not be true. 0 is not less than or equal to -3, therefore (0,0) does not satisfy the inequality.
8 0
3 years ago
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