All categories

3 years ago

The sum of 5 and twice a number.

Mathematics

2 answers:

FromTheMoon [43]3 years ago

8 0

Answer:

5 + 2x

Step-by-step explanation:

Sum means your adding so it would be 5 + any given number which you can call x times by 2. Which is 5 + 2x

snow_lady [41]3 years ago

4 0

Answer:

5+x2

Step-by-step explanation:

You might be interested in

PLS HELP ASAP ILL GIVE BRAINLKEST PLS THANKS ASAP

Nataly [62]

Answer:

they choose candidates before the general election

3 0

2 years ago

Use trigonometric substitution to evaluate the integral 13 + 12x − x2 dx . First, write the expression under the radical in an a

SCORPION-xisa [38]

I don't see a square root sign anywhere, so I'll assume the integral is

$\displaystyle\int\sqrt{13+12x-x^2}\,\mathrm dx$

First complete the square:

$13+12x-x^2=49-(6-x)^2=7^2-(6-x)^2$

Now in the integral, substitute

$6-x=7\sin t\implies\mathrm dx=-7\cos t\,\mathrm dt$

so that

$t=\sin^{-1}\left(\dfrac{6-x}7\right)$

Under this change of variables, we have

$7^2-(6-x)^2=7^2-7^2\sin^2t=7^2(1-\sin^2t)=7^2\cos^2t$

so that

$\displaystyle\int\sqrt{13+12x-x^2}\,\mathrm dx=-7\int\sqrt{7^2\cos^2t}\,\cos t\,\mathrm dt=-49\int|\cos t|\cos t\,\mathrm dt$

Under the right conditions, namely that cos(<em>t</em>) > 0, we can further reduce the integrand to

$|\cos t|\cos t=\cos^2t=\dfrac{1+\cos(2t)}2$

$\displaystyle-49\int|\cos t|\cos t\,\mathrm dt=-\frac{49}2\int(1+\cos(2t))\,\mathrm dt=-\frac{49}2\left(t+\frac12\sin(2t)\right)+C$

Expand the sine term as

$\dfrac12\sin(2t)}=\sin t\cos t$

Then

$t=\sin^{-1}\left(\dfrac{6-x}7\right)\implies \sin t=\dfrac{6-x}7$

$t=\sin^{-1}\left(\dfrac{6-x}7\right)\implies \cos t=\sqrt{7^2-(6-x)^2}=\sqrt{13+12x-x^2}$

So the integral is

$\displaystyle-\frac{49}2\left(\sin^{-1}\left(\dfrac{6-x}7\right)+\dfrac{6-x}7\sqrt{13+12x-x^2}\right)+C$

3 0

3 years ago

The sale price of a pair of sneakers was $33.75. What is the discount % if the original cost is $75?

STALIN [3.7K]

Answer:

55%

Step-by-step explanation:

To find the percent discount

Take the original price and subtract the new price

75-33.75 =41.25

Divide this by the original price

41.25/75

.55

Multiply by 100

55%

This is the percent decrease

5 0

2 years ago

Read 2 more answers

Did I do this right? If pls tell me how to fix it. <br><br> Pls, look at the attachment.

anastassius [24]

It looks all good to me! :) gj

7 0

2 years ago

Maths! please help! will give brainliest!

Gwar [14]

Answer:

weird shape but.... i would say the answer is... 1=2.14ab

Step-by-step explanation:

8 0

3 years ago