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3 years ago

Multiply 9· (-1) can u pls help me with this q

Mathematics

1 answer:

kirill115 [55]3 years ago

6 0

A positive times a negative will always be negative
9 x -1 = -9
-9, Hope this helps!

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Let r(t)=⟨t2,1−t,4t⟩. calculate the derivative of r(t)⋅a(t) at t=5, assuming that a(5)=⟨−4,4,−5⟩ and a′(5)=⟨−5,9,3⟩

erastovalidia [21]

$\mathbf r(t)=\langle t^2,1-t,4t\rangle$
$\implies\mathbf r'(t)=\langle 2t,-1,4\rangle$

$\dfrac{\mathrm d(\mathbf r(t)\cdot\mathbf a(t))}{\mathrm dt}\bigg|_{t=5}=\mathbf r'(5)\cdot\mathbf a(5)+\mathbf r(5)\cdot\mathbf a'(5)$
$=\langle10,-1,4\rangle\cdot\langle-4,4,-5\rangle+\langle25,-4,20\rangle\cdot\langle-5,9,3\rangle$
$=(-40-4-20)+(-125-36+60)$
$=-165$

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3 years ago

Count one of four equal parts

Sedbober [7]

Answer:

i think this is it 1/4 but need more context

Hope this helps :)

Step-by-step explanation:

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2 years ago

Round to nearest tenth

Goshia [24]

Answer:

Step-by-step explanation:

this is exactly the same as the 1st one, just they put it in a different orientation. sooo use law of cosines , where

QR = c

a = 12

b = 23

cos(120) = cos (P)

c = sq rt [ a^2+b^2﹣2*a*b*cos(P) ]

QR = sq rt [ 12^2 + 23^2 - 2* 12*23*cos(120) ]

QR = sq rt [ 144 + 529 - 552 * (-0.5 0 ]

QR = sq rt [ 673 + 276 ]

QR = sq rt [ 949 ]

QR = 30.8058

rounded to nearest 10th is

QR = 30.8 :)

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2 years ago

I need help with trig

Taya2010 [7]

Answer:

sinθ = p/h = 4/6= 2/3

θ = 41 degrees

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2 years ago

19 is 20%of what number

zloy xaker [14]

Answer:

19 is 20% of 95.

Step-by-step explanation:

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2 years ago