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3 years ago

Gggrrgggjgfgg fr kk had

Mathematics

2 answers:

notka56 [123]3 years ago

6 0

Answer:

B) No

Step-by-step explanation:

the expressions are not equivalent

marusya05 [52]3 years ago

4 0

Question- Are the following expression equivalent

Answer- B)

Explanation- The expressions are not equivalent

-Tay did this

-Hope this help

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If the price of an item is $34 and the sales tax on it is $1.36,what is the sales-tax rate?

Mandarinka [93]

The tax is 4%, do 1.36 divided by 34

5 0

4 years ago

If three times a number minus 2 equals 13, what is the number?

Nana76 [90]

Change the messy words into numerals
3 times a number minus 2    equals    13
3 × n - 2 = 13

3n - 2 = 13
take 2 to the other side
3n - 2 + (2) = 13 + (2)
3n = 15

Divide by 3 on either sides to isolate n
$\frac{3n}{3}$ = $\frac{15}{3}$
3 and 3 cancels out

n = 5

check:
3 times 5 minus 2 equals 13
3   × 5 - 2 = 13
15 - 2 = 13
13 =    13

The number is 5

3 0

4 years ago

A. Evaluate ∫20 tan 2x sec^2 2x dx using the substitution u = tan 2x.

irakobra [83]

Answer:

The integral is equal to $5\sec^2(2x)+C$ for an arbitrary constant C.

Step-by-step explanation:

a) If $u=\tan(2x)$ then $du=2\sec^2(2x)dx$ so the integral becomes $\int 20\tan(2x)\sec^2(2x)dx=\int 10\tan(2x) (2\sec^2(2x))dx=\int 10udu=\frac{u^2}{2}+C=10(\int udu)=10(\frac{u^2}{2}+C)=5\tan^2(2x)+C$ . (the constant of integration is actually 5C, but this doesn't affect the result when taking derivatives, so we still denote it by C)

b) In this case $u=\sec(2x)$ hence $du=2\tan(2x)\sec(2x)dx$ . We rewrite the integral as $\int 20\tan(2x)\sec^2(2x)dx=\int 10\sec(2x) (2\tan(2x)\sec(2x))dx=\int 10udu=5\frac{u^2}{2}+C=5\sec^2(2x)+C$ .

c) We use the trigonometric identity $\tan(2x)^2+1=\sec(2x)^2$ is part b). The value of the integral is $5\sec^2(2x)+C=5(\tan^2(2x)+1)+C=5\tan^2(2x)+5+C=5\tan^2(2x)+C$ . which coincides with part a)

Note that we just replaced 5+C by C. This is because we are asked for an indefinite integral. Each value of C defines a unique antiderivative, but we are not interested in specific values of C as this integral is the family of all antiderivatives. Part a) and b) don't coincide for specific values of C (they would if we were working with a definite integral), but they do represent the same family of functions.

3 0

3 years ago

Evaluate 4 - 6 + 9 - 3

omeli [17]

$4 - 6 + 9 - 3$

$= 4$

3 0

3 years ago

PLEASE SOVEL THIS I WILL GIVE OUT 20 POINT

Anettt [7]

9514 1404 393

Answer:

21.25 seconds

Step-by-step explanation:

In miles per second, the speed of the jet is ...

(720 mi/h)/(3600 s/h) = 1/5 mi/s

The speed of the sound is the same:

(1 mi)/(5 s) = 1/5 mi/s

Then the rate of closure between the airplane and the sound is ...

(1/5 mi/s) +(1/5 mi/s) = 2/5 mi/s

To find the time required to close a gap of 8 1/2 miles, we can use the relation ...

time = distance/speed

time = (8.5 mi)/(0.4 mi/s) = 21.25 s

The pilot will hear the thunder 21.25 seconds after the flash.

5 0

3 years ago