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Mice21 [21]
3 years ago
7

Which are correct definitions for history?

Mathematics
1 answer:
Rina8888 [55]3 years ago
6 0
B. An account of the impact of human behavior on the environment, C. the story of human activity before writing was developed, D. the story of change over time documented with evidence.
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A building is 139 ft tall.at noon it cast a shadow a 219- ft.what is the sun’s angle of elevation at that time.
adelina 88 [10]

Answer:

S = 32.4 degrees


7 0
2 years ago
Sec s = 1.6948
Anastaziya [24]
That'd be true only if the value of "s" is the exact same one for both
namely  if sec(s) = cos(s)
then solving for "s"
thus

\bf sec(s)=cos(s)\qquad but\implies sec(\theta)=\cfrac{1}{cos(\theta)}
\\\\\\
thus\cfrac{1}{cos(s)}=cos(s)\implies 1=cos^2(s)\implies \pm \sqrt{1}=cos(s)
\\\\\\
\pm 1=cos(s)\impliedby \textit{now taking }cos^{-1}\textit{ to both sides}
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cos^{-1}(\pm 1)=cos^{-1}[cos(s)]\implies cos^{-1}(\pm 1)=\measuredangle s
5 0
3 years ago
Help please I need answers for these questions
LekaFEV [45]

I think because the angles are corresponding/opposite to each other u equate them to 180°

7 0
2 years ago
Find the value of k for x^2 - 2kx+7k -12=0 so that they have two equal roots
Alisiya [41]

Step-by-step explanation:

x^2 -2kx +7k -12 = 0

two equal roots -->Δ = b^2 -4ac = 4k^2 - 4(7k-12)=0 = 4(k^2 - 7k +12)=4(k-4)(k-3)=0

so k =3 and k =4

5 0
2 years ago
Evaluate the series 2 + 8 + 32 + 128 + 512 + 2048.
Sauron [17]
The answer is C) 2730
7 0
3 years ago
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