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Svetradugi [14.3K]
3 years ago
7

Please help ? i have no clue what i’m doing

Mathematics
1 answer:
Anit [1.1K]3 years ago
7 0

Step-by-step explanation:

2( l + w ) = perimeter of triangle

P = 2( 10+8 )

p= 2(18)

p= 36cm

Circle = pie (r) + d. recall d = 2r

P= 3.142 (4) + 8

P= 20.57~

so therefore= , 36 + 2(20.57)= 77.14cm ~ to the nearest tenths

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Step-by-step explanation:

Y<3*Z

Y<3Z

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3 years ago
Find sin 2x, cos 2x, and tan 2x from the given information.<br> cscx=4,tanx&lt;0.
lutik1710 [3]

Answer:

Step-by-step explanation:

Given the expression cosec (x) = 4 and tan(x)< 0

since cosec x = 1/sinx

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From SOH, CAH TOA

sinθ = opposite/hypotenuse

from sinx = 1/4

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to get the adjacent, we will use the Pythagoras theorem

adj² = 4²-1²

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tanx = opposite/adjacent = 1/√15

since tan < 0, then tanx = -1/√15

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sin2x = √15/8

for cos2x;

cos2x = 1-2sin²x

cos2x = 1-2(1/4)²

cos2x = 1-2(1/16)

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cos2x = 7/8

for tan2x;

tan2x  = tanx + tanx/1-tan²x

tan2x = 2tanx/1-tan²x

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tan2x = (-2/√15)/(1-1/15)

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tan2x = -30/14√15

tan2x = -30/7√15

rationalize

tan2x =  -30/7√15 * √15/√15

tan2x =  -30√15/7*15

tan2x =  -2√15/7

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3 years ago
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Answer:

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X axis is -

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Crank

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