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Scorpion4ik [409]
3 years ago
7

Verify the identity. tan(x+(pi/2)) = -cot x

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
4 0
Tan (x + π/2) = [sin (x + π/2) / cos (x + π/2)] = [sin x cos π/2 + sin π/2 cos x] / [cos x cos π/2 - sin x sin π/2] = cos x / - sin x = -cot x
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Determine which ordered pair is a solution of y = –5x + 10. a. (–15, 5)
maria [59]
Y = - 5 x + 10
A ) x = - 15, y = 5
5 = 75 + 10
5 ≠ 85
B ) x = 2, y = 0
0 = - 5 · 2 + 10
0 = 0  ( correct )
C ) x = - 1,  y = - 5,
- 5 = 5 + 10
- 5 ≠ 15
D ) x = 3, y = 25
25 = - 15 + 10
25 ≠ - 5
Answer:
B ) ( 2, 0 )
7 0
3 years ago
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If a person's eye level is h meters above sea level and he can see d kilometers to the horizon, then d=3.57h. Suppose the person
olga2289 [7]

Answer:

54.3m

Step-by-step explanation:

h = distance above sea level

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d = 3.57 × 15.21

d = 54.2997m approximately 54.3m

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6 0
3 years ago
Circle the expressions that represent 10% of the original cost
Anni [7]

Answer:

What are the choices?

Step-by-step explanation:


5 0
4 years ago
Solve − 2 x − 10 y = 10
skad [1K]

Answer:

x=-10 and y=1

Step-by-step explanation:

-2(-10)=20

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20-10=10

8 0
3 years ago
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Subtract --4x2 + 3x - 7 from 8x2 + 2x - 3
r-ruslan [8.4K]

Answer:

23

Steps ig

((8x2) +2x(-3)))-(((-(-4)) x 2) +( 3 x( -7)) =23

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3 years ago
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