3 years ago

PLEASE HELP AND ANSWER BOTH QUESTIONS

Mathematics

2 answers:

kati45 [8]3 years ago

5 0

1.) 16k^2 + 56kj + 49j^2

2.) 4y^2 - 36xy + 81x^2

nydimaria [60]3 years ago

3 0

D is your answer

Expand and do FOIL method (first outside inside last)
simplify and then choose right answer

A is your answer

Do the same thing

hope this helps

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An automobile travels past the farmhouse at a speed of v = 45 km/h. How fast is the distance between the automobile and the farm

yulyashka [42]

Answer:

$\frac{ds}{dt} = 39.586 km/h$

Step-by-step explanation:

let distance between farmhouse and road is 2 km

From diagram given

p is the distance between road and past the intersection of highway

By using Pythagoras theorem

$s^2 = 2^2 +p^2$

differentiate wrt t

we get

$\frac{d}{dt} s^2 = \frac{d}{dt} (4 + p^2)$

$2s \frac{ds}{dt} =2p \frac{dp}{dt}$

$\frac{ds}{dt} = \frac{p}{s}\frac{dp}{dt}$

$\frac{ds}{dt} = \frac{p}{\sqrt{p^2 +4}} \frac{dp}{dt}$

putting p = 3.7 km

$\frac{ds}{dt} = \frac{3.7}{\sqrt{3.7^2 +4}} 45$

$\frac{ds}{dt} = 39.586 km/h$

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3 years ago

The vertex from a quadratic function is f(x)=a(x-h)^2+k what is the vertex if each function match the function rule with the coo

MrMuchimi

Answer: (h,k)

Step-by-step explanation: remember that H is your x coordinate and should be the opposite sign of what's in the parenthesis.

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3 years ago

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Simplify (15x+25)-(8x-15)

Harrizon [31]

7x+40... If you go to mathwarehouse.com you can type your question in and you'll get an answer in less than a second

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Gre4nikov [31]

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Step-by-step explanation:

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3 years ago

In ∆abc, m∠cab = 2x and m∠acb = x + 30. if line segment a b is extended through point b to point d, m∠cbd = 5x − 50. what is t

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The answer is option "3, 40".

<span>m∠cab = 2x
m∠acb = x + 30
m∠cbd = 5x − 50
Now,
</span>m∠cab + m∠acb = m∠cbd
2x+x+30 = 5x-50
2x+x-5x = -50-30
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x = 40

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3 years ago