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3 years ago

Evaluate 8j-k+14when j=0.25 and k =1

Mathematics

1 answer:

nevsk [136]3 years ago

5 0

Answer:

8j-k+14

8(0.25)-1+14=2-1+14=15

Step-by-step explanation:

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100 POINTS!!!!!!! I WILL GIVE BRAINLIEST!

abruzzese [7]

Answer:

8.4 miles

Step-by-step explanation:

Let the speed in the morning be s, then in the evening it is s - 4

The distance is equal both directions:

45 min *s = 1 hr 10 min *(s - 4)

Time in hours:

45*1/60*s = (1 + 10*1/60)(s - 4)
3/4s = 7/6s - 7/6*4

Multiply all terms by 12 to clear fraction:

9s = 14s - 56
5s = 56
s = 56/5
s= 11.2 mph

The distance is:

3/4*11.2 = 0.75*11.2 = 8.4 miles

3 0

3 years ago

If x plus one upon X equal to 11 find the value of x square + 1 upon x square

zubka84 [21]

119 <answer (check the solution in above pic)

hey friend i hope this answer is helpful

marl as brainliest if i deserve

6 0

3 years ago

Sin(73) = cos (x) pls help lol

viva [34]

X = 17+360n, 343+360n

5 0

3 years ago

Let f be defined by the function f(x) = 1/(x^2+9)

riadik2000 [5.3K]

(a)

$\displaystyle\int_3^\infty \frac{\mathrm dx}{x^2+9}=\lim_{b\to\infty}\int_{x=3}^{x=b}\frac{\mathrm dx}{x^2+9}$

Substitute x = 3 tan(t ) and dx = 3 sec²(t ) dt :

$\displaystyle\lim_{b\to\infty}\int_{t=\arctan(1)}^{t=\arctan\left(\frac b3\right)}\frac{3\sec^2(t)}{(3\tan(t))^2+9}\,\mathrm dt=\frac13\lim_{b\to\infty}\int_{t=\arctan(1)}^{t=\arctan\left(\frac b3\right)}\mathrm dt$

$=\displaystyle \frac13 \lim_{b\to\infty}\left(\arctan\left(\frac b3\right)-\arctan(1)\right)=\boxed{\dfrac\pi{12}}$

(b) The series

$\displaystyle \sum_{n=3}^\infty \frac1{n^2+9}$

converges by comparison to the convergent p-series,

$\displaystyle\sum_{n=3}^\infty\frac1{n^2}$

$\displaystyle \sum_{n=1}^\infty \frac{(-1)^n (n^2+9)}{e^n}$

converges absolutely, since

$\displaystyle \sum_{n=1}^\infty \left|\frac{(-1)^n (n^2+9)}{e^n}\right|=\sum_{n=1}^\infty \frac{n^2+9}{e^n} < \sum_{n=1}^\infty \frac{n^2}{e^n} < \sum_{n=1}^\infty \frac1{e^n}=\frac1{e-1}$

That is, ∑ (-1)ⁿ (n ² + 9)/eⁿ converges absolutely because ∑ |(-1)ⁿ (n ² + 9)/eⁿ| = ∑ (n ² + 9)/eⁿ in turn converges by comparison to a geometric series.

5 0

3 years ago

How do i cancel this app? -i was just charged $24 and do not have a subscription - what gives Brainly? How do I get my refund? L

ArbitrLikvidat [17]

Go to Settings > [Your Name] > iTunes & App Store.

Tap your Apple ID account and select View Apple ID.

Sign in with Face ID, Touch ID, or your Apple ID password.

Tap Subscriptions, then select an active subscription.

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4 0

3 years ago