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rusak2 [61]
3 years ago
8

HELPP ME PLZ IM VERY CONFUSED

Mathematics
1 answer:
Illusion [34]3 years ago
6 0
1st answer none of the above. these are the same angle and have sin of -1

#66 true -360° is the same as+360° and sin here is 0

67. true

68 neither. cos is -1 at 180 and -180

69 false, tan is undefined there

70 undefined

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If cos x=−6/7, and 90°
ankoles [38]

Answer: 0.4693877

Step-by-step explanation:

Given that:

cos x=−6/7,

From trigonometry :

Cosx + sinx = 1

Cos2x = cos(x + x)

Recall the double angle identity:

Cos2x = 2cos^2x - 1

Sin2x = 1 - 2sin^2x

Since cosx = - 6/7

Then

Cos2x = 2cos^2x - 1

Cos2x = 2cosx^2 - 1

Cos2x = 2(-6/7)^2 - 1

Cos2x = 2(36/49) - 1

Cos2x = 2 * (72/98) - 1

Cos2x = (2 * 0.7346938) - 1

Cos 2x = ( 1.4693877 - 1)

Cos2x = 0.4693877

4 0
3 years ago
answer options: 15,16,16,17. (yes there are two 16's on the answer format), i tried making it 98 points because i have 709, but
lord [1]

Answer:

I believe the answer is 17

Step-by-step explanation:

If you count the length of it by counting how many of the tiny squares it is on it is 17.

5 0
3 years ago
Jim is saving nickels, dimes and quarters to buy a baseball mitt. He has 12 more
Harrizon [31]

Answer:

36 quarters   48 dimes  64 nickels

Step-by-step explanation:

quarter = q

dime = q+12

nickel = 2q-8

$17 = 1,700 cents

(q)25 + (q+12)10 + (2q-8)5 = 1,700

25q +10q+120  +10q-40 =1,700

45q+80 = 1,700

45q = 1620

q= 36      

 36     QUARTERS x25 =  900cents

 48 DIMES    x10      =         480 cents

  64 NICKELS x 5 =             320 cents

  TOTAL                              1,700 cents ($17)

5 0
3 years ago
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drek231 [11]

Answer:

3

Step-by-step explanation:

8 0
3 years ago
If 7x = 24 y, find the ratio of x to y.​
MArishka [77]

Answer:

7:24 or \frac{7}{24}

Step-by-step explanation:

a ratio is usually defined as a fraction ( the first to the next)

8 0
3 years ago
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