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3 years ago

Could someone help me please ?

Mathematics

2 answers:

natka813 [3]3 years ago

8 0

Answer:

Add the 2 numbers up together. Thatś how I have learned to do it anyway. maybe someone else has something different.

Step-by-step explanation:

seropon [69]3 years ago

7 0

Answer:

19.4 (rounded to 3 significant figures)

Step-by-step explanation:

SOH CAH TOA

You would use CAH for this question because you are told to find the length for BC, which is the hypotenuse and you are told the adjacent line is 6.3cm.

H=A÷C

=6.3÷cos(71)

=19.3507869666

H=19.4 (rounded to 3 significant figures)

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Integration by Parts Evaluate e-2x cos(2x) dx.

kifflom [539]

Let

$I = \displaystyle \int e^{-2x} \cos(2x) \, dx[/]texIntegrate by parts:[tex]\displaystyle \int u \, dv = uv - \int v \, du$

with

$u = e^{-2x} \implies du = -2 e^{-2x} \, dx \\\\ dv = \cos(2x) \, dx \implies v = \dfrac12 \sin(2x)$

Then

$\displaystyle I = \frac12 e^{-2x} \sin(2x) + \int e^{-2x} \sin(2x) \, dx + C$

Integrate by parts again, this time with

$u = e^{-2x} \implies du = -2 e^{-2x} \, dx \\\\ dv = \sin(2x) \, dx \implies v = -\dfrac12 \cos(2x)$

so that

$\displaystyle I = \frac12 e^{-2x} \sin(2x) - \frac12 e^{-2x} \cos(2x) - \int e^{-2x} \cos(2x) \, dx + C\\\\ \implies I = \frac{\sin(2x)-\cos(2x)}{2e^{2x}} - I + C \\\\ \implies 2I = \frac{\sin(2x) - \cos(2x)}{2e^{2x}} + C \\\\ \implies I = \boxed{\frac{\sin(2x) - \cos(2x)}{4e^{2x}} + C}$

6 0

1 year ago

Pls and step by step

Arturiano [62]

Answer:

Step-by-step explanation:

90+75=135

135-125

7 0

2 years ago

What is 2 1/4 equal to

Crazy boy [7]

Answer:

2.25

Step-by-step explanation:

divide

5 0

2 years ago

Read 2 more answers

PLS HELP ILL GIVE BRAINLIST!

vagabundo [1.1K]

Answer:

the third one

Step-by-step explanation:

8 0

2 years ago

What fraction is greater than C on the given number line above?

Ghella [55]

Answer:

2/5

Step-by-step explanation:

C is at the second tick of 6 segements, so C = 2/6 = 1/3.

If we convert all fractions to /60, you can easily see the answer:

1/3 = 20/60

2/5 = 24/60

1/4 = 15/60

1/5 = 12/60

So we're looking for an answer larger than 20/60, which is only 24/60, a.k.a. 2/5.

4 0

3 years ago

Read 2 more answers