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zlopas [31]
2 years ago
10

Cos(-170°) = _____ -cos10° cos10° cos(-10°)

Mathematics
1 answer:
Lera25 [3.4K]2 years ago
7 0

Answer:

<h3>-cos10°</h3>

Step-by-step explanation:

cos is positive at first and fourth quadrant

so, cos (-x) = cos (x)

also, cos(180-x) = -cos x

        cos (180+x) = -cos x

cos (-170°) = cos (170°)

cos(170°) = cos (180° - 10°)

              =  - cos 10°

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(-3x^2+x^4+x)+(2x^4-7+4x)
iragen [17]

1. Remove parentheses

-3x^2 + x^4 + x + 2x^4 - 7 + 4x

2. Collect like terms

-3x^2 + (x^4 + 2x^4) + (x + 4x) - 7

3. Simplify

-3x^2 + 3x^4 + 5x - 7

6 0
3 years ago
The perimeter of the original rectangle is 16 feet. A small rectangle has a length of 6.2 feet and width of 1.8 feet. A larger r
GalinKa [24]

Answer:

  32 ft

Step-by-step explanation:

The length of the larger rectangle is double that of the smaller one. If we assume the rectangles are similar, the perimeter will be double as well:

  2·(16 ft) = 32 feet . . . . perimeter of larger rectangle

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5 0
3 years ago
Read 2 more answers
Trevor is racing his dirt bike at about 30 miles per hour. If he keep a up this rate for an hour and a half, how many miles will
Free_Kalibri [48]

Answer: 45 miles


Step-by-step explanation:

Since Trevor rides 30 mph and does this for 1.5 hours, multiply 30 by 1.5


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3 0
3 years ago
1.) Consider the right triangle below in which a = 5 and b = 5.
patriot [66]

Answer:

c=7.07

Step-by-step explanation:

c²=a²+b²

c²=5²+5²

c²=25+25

c²=50

c=√50

c=7.07

B. c=7.07 (to nearest hundredth)

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3 0
2 years ago
Factor this expression completely. 9x (squared) -16​
notsponge [240]
Soln,

here

9 {x}^{2} - 16

= ( {3x)}^{2} - {4}^{2}

= (3x + 4)(3x - 4)
I hope this was helpful.
3 0
3 years ago
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