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4 years ago

7

I NEED UR HELP PLEASE ANSWER THIS QUESTION ASAP!!!!!

1 answer:

SVEN [57.7K]4 years ago

6 0

1/ we make -3*and and we have y=-1 and we replaced to have x=6 2/ any answer x=(7y+3)÷2 If we change answer of x in the second equation we get -7y-3+7y=-3 3/ x=-4+2y we change it in the second equation and we get y =1 if replace it in the first we have x=-2 4/ B=10 and C=16 5/ a= false b=true c=true d=true

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3 years ago

A ladder 25 feet long is leaning againstthe wall of a house. The base of the ladder ispulled away from the wall at a rate of 2 f

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Answer: a) -7/12 ft/s, -20 ft/s, -7 ft/s

b) 527/24 Ft²/s

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Step-by-step explanation:

a) b=7 ; a^2+b^2 = 25^2

a^2+b^2 = 625

Differentiate w.r.t = 2a (da/dt) + 2b ( db/dt) = 0

$b(db/dt) = -a(da/dt)$

As found from above put a=24 b=7,15 and 24. You will get the reuqired answer.

b) Area of the triangle = 1/2 * b*h

differentiate wrt to time leads to the following relation:

$2dA/dt= h(db/dt)+b(dh/dt) \\dA/dt=24-49/24 = 527/24 Ft^2/sec$

c) sin (Θ) = b/25

differentiate it again to give

$cos(0.284)(d\theta/dt) = (1/25) (db/dt) \\=2/25 rad/sec$

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3 years ago