3 years ago

Lacy has completed 65% of the 20 questions on the test. how many questions has she completed?

Mathematics

2 answers:

inysia [295]3 years ago

7 0

She has completed 13 answers out of 20 that would equal 65%

Goryan [66]3 years ago

5 0

She has completed 13 answers.

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Which of the following shows 5x + 17 + 8x – 9 + 2y in simplest terms?

Nata [24]

Answer:

13x + 2y + 8

Step-by-step explanation:

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Find the differential of each function. (a) y = tan( 7t ) dy = Incorrect: Your answer is incorrect. (b) y = 4 − v2 4 + v2 dy =

Kisachek [45]

Answer:

$(a) dy= 7sec^2(7t)dt\\\\(b) dy = \frac{-16v}{(4+v^2)^2} dv$

Step-by-step explanation:

Given;

(a) y = tan (7t)

let u = 7t

y = tan(u)

du/dt = 7

dy/du = sec²(u)

$\frac{dy}{dt} = \frac{dy}{du} *\frac{du}{dt}\\\\\frac{dy}{dt} = sec^2(u)* 7\\\\\frac{dy}{dt} =7sec^2(u)\\\\\frac{dy}{dt} = 7sec^2(7t)\\\\dy = 7sec^2(7t)dt$

(b)

$y = \frac{4-v^2}{4+v^2}\\\\$

let u = 4 - v²

du/dv = -2v

let v = 4 + v²

dv/du = 2v

$y = \frac{4-v^2}{4+v^2}\\\\\frac{dy}{dv} = \frac{vdu-udv}{v^2} \\\\\frac{dy}{dv} =\frac{-2v(4+v^2)-2v(4-v^2)}{(4+v^2)^2}\\\\\frac{dy}{dv} =\frac{-8v-2v^3-8v+2v^3}{(4+v^2)^2}\\\\\frac{dy}{dv} =\frac{-16v}{(4+v^2)^2}\\\\dy = \frac{-16v}{(4+v^2)^2}dv$

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3 years ago

What is the solution of the following system of equation x +y = 2 x - y = 4

sergiy2304 [10]

Answer:

X+y=2

x-y=4

(x+y)+(x-y)= 2+4

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2x=6

X=3

3+y=2 or 3-y=4

Y=-1

3+(-1)=2 or 3-(-1)=4

Step-by-station:

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