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Feliz [49]
2 years ago
12

Please help with question 4A,B please Thank you

Mathematics
1 answer:
mrs_skeptik [129]2 years ago
4 0
<h3>Given</h3>
  • C(t) = 40 cm + t·(2/5 cm/s) . . . circumference of a circle vs time
<h3>Find</h3>
  • dr/dt for radius r
  • r at t=4 seconds
<h3>Solution</h3>

The circumference and radius of a circle are related by

... C = 2πr

so the radius in terms of circumference is

... r = C/(2π)

... r(t) = (40 +0.4t)/(2π) = (1/π)(20 cm + 0.2t cm/s)

Then dr/dt is

... dr/dt = 0.2/π cm/s

And the radius at t=4 s is

... r(4) = (1/π)(20 + 0.2·4) cm

... r(4) = 20.8/π cm

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How do you write 9218000 in scientific notation?
Alexeev081 [22]

Hello


I believe it is 9000000 200000 10000 8000

i could be wrong though


hope this helps

plz mark me as brainliest

4 0
3 years ago
Read 2 more answers
Find Root of:<br>Find √49x25 = ?​
VikaD [51]

Answer:

±35

Step-by-step explanation:

sqrt(49*25)=sqrt(49)*sqrt(25)=±7*±5=±35

7 0
3 years ago
I need help with this question please.
vredina [299]

Answer:

tan(2x)=-24/7

Step-by-step explanation:

Since tan(x)=sin(x)/cos(x)

We are going to need sin(x) any time, so lets find it right away.

To do this, remember that. sin(x)^2 + cos(x)^2=1

so. sin(x)= \sqrt{1 - (cos(x)^{2} )}=\sqrt{1-(-4/5)^{2} }

This leads to.

\sqrt{\frac{25-16}{25} } =\sqrt{\frac{9}{25} }=+/- 3-5

We have obtained two solutions, -3/5 and 3/5.

We need to pick one, since not all of them are correct for our scenario, in this case, we've been told that x belongs to the range [180, 270], in this range, sin(x)<0.

So in our previous solution, we have that sin(x)= -3/5

Now, to find tang(2x), we need to apply the definition

Tang(2x)=sin(2x)/cos(2x).

Lets remember that

sin(2x)=2*sin(x)*cos(x)

cos(2x)=cos(x)^2 - sin(x)^2.

Lets evaluate our given result.

sin(2x)=2*(-3/5)*(4/5)=-24/25

cos(2x)=(-4/5)^2 - (3/5)^2=7/25

Hence

tan(2x)= -(24/25) / (7/25)=-24/7

5 0
3 years ago
Given that ƒ(x) = x2 + 1 and g(x) = –3, multiply the functions (g · ƒ)(x). Question 8 options: A) (g · ƒ)(x) = –3x2 – 3 B) (g ·
vesna_86 [32]

Answer:

A

Step-by-step explanation:

We are given the two functions:

f(x)=x^2+1\text{ and } g(x)=-3

And we want to find:

(g\cdot f)(x)

This is equivalent to:

=g(x)\cdot f(x)

Substitute:

=(-3)\cdot (x^2+1)

Distribute:

=-3x^2-3

Therefore:

(g\cdot f)(x)=-3x^2-3

So, our answer is A.

5 0
2 years ago
Como resuelvo esto y=1+2(4/5)
laila [671]

Answer:

Es 2.6

Step-by-step explanation:

7 0
3 years ago
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