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3 years ago

Explain how the number devil helps the author convince readers that mathematics is fun.

2 answers:

8 0

Answer:The author helps persuade readers that math is fun by showing the number devil doing math in clever ways. The author also shows how Robert becomes less afraid of math. Readers can relate to this message and might be convinced to like math more themselves.

Step-by-step explanation: Because it is stated in the story once or twice

lana [24]3 years ago

4 0

Answer:

The author helps persuade readers that math is fun by showing the number devil doing math in clever ways. The author also shows how Robert becomes less afraid of math. Readers can relate to this message and might be convinced to like math more themselves.

Step-by-step explanation:

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Line segment pq shown on the graph below, is rotated 90 counterclockwise about point q to form pq

USPshnik [31]

Answer:

this isn’t a 100% guaranteed correct answer but maybe the second option saying “PQ and P’G’ are parallel”

(i’m doing the test rn)

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3 years ago

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Express tan J as a fraction in simplest terms

Goryan [66]

Answer is TanJ=8/15 if that’s what your asking

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2 years ago

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The bill for a meal at a restaurant before tax is $84.00. The sales tax rate is 7% and you want to leave a 20% tip based on the

34kurt

Find 20% first
20% of 84 is 16.8

tax is 7% of 84 which is 5.88

total

84+16.8+5.88=$106.68

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3 years ago

Find the value of the variable using these steps.

Aleks [24]

$0.4x+3.9=5.78$ ⇒ subtracting 3.9 form both sides

$0.4x+3.9-3.9=5.78-3.9$

$0.4x=1.88$ ⇒ Divide both sides by 0.4

$\frac{0.4x}{0.4}= \frac{1.88}{0.4}$

$x=4.7$

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3 years ago

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The acceleration of an object (in m/s^2) is given by the function a(t) = 9 sin(t). The initial velocity of the object is v(0) =

pentagon [3]

a) Acceleration is the derivative of velocity. By the fundamental theorem of calculus,

$v(t)=v(0)+\displaystyle\int_0^ta(u)\,\mathrm du$

so that

$v(t)=\left(-11\frac{\rm m}{\rm s}\right)+\int_0^t9\sin u\,\mathrm du$

$\boxed{v(t)=-\left(2+9\cos t)\right)\frac{\rm m}{\rm s}}$

b) We get the displacement by integrating the velocity function like above. Assume the object starts at the origin, so that its initial position is $s(0)=0\,\mathrm m$ . Then its displacement over the time interval [0, 3] is

$s(0)+\displaystyle\int_0^3v(t)\,\mathrm dt=-\int_0^3(2+9\cos t)\,\mathrm dt=\boxed{-6-9\sin3}$

c) The total distance traveled is the integral of the absolute value of the velocity function:

$s(0)+\displaystyle\int_0^3|v(t)|\,\mathrm dt$

$v(t)$ for $0\le t$ and $v(t)\ge0$ for $\cos^{-1}\left(-\frac29\right)\le t\le3$ , so we split the integral into two as

$\displaystyle\int_0^{\cos^{-1}\left(-\frac29\right)}-v(t)\,\mathrm dt+\int_{\cos^{-1}\left(-\frac29\right)}^3v(t)\,\mathrm dt$

$=\displaystyle\int_0^{\cos^{-1}\left(-\frac29\right)}(2+9\cos t)\,\mathrm dt-\int_{\cos^{-1}\left(-\frac29\right)}^3(2+9\cos t)\,\mathrm dt$

$\displaystyle=\boxed{2\sqrt{77}-6+4\cos^{-1}\left(-\frac29\right)-9\sin3}$

4 0

3 years ago