1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Feliz [49]
3 years ago
12

Please help with question 4A,B please Thank you

Mathematics
1 answer:
mrs_skeptik [129]3 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

You might be interested in
Cuanto 5 entre 6'658
Citrus2011 [14]
Es 1,331.6
................
7 0
3 years ago
Help HeLp HelP HELLPPPP!!
julsineya [31]

Answer: the circle wth 3 covered goes in 1/2 and the rectangle and the other circle go in 3/5 the small square with 2 covered goes in other and the long line of squares goes in other

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Brahmagupta solved a quadratic equation of the form ax2 + bx = c using the formula x =, which involved only one solution. Using
weeeeeb [17]
X2+7x-8=0
product=-8 times 1 = -8
sum= 7
{-1, 8}
x2-1x+8x-8=0
x(x-1)+8(x-1)=0
x+8=0 or X-1=0
x=-8
4 0
3 years ago
Read 2 more answers
This section of a concrete skateboard ramp has the shape of a triangular prism. Find the volume of the triangular prism. Find th
NISA [10]

Answer:

The volume of the triangular prism: 59.2 ft^{3}

The value of the concrete used is: 16*4 = $64

Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.  Please have a look at the attached photo

My answer:

As we know that, the formula to find out the volume of the triangular prism is:

V = \frac{1}{2} a*b*h when h is the height and a&b are the length of the two square edges. So we have:

  • V = \frac{1}{2}*4*4*7.4 = 59.2 ft^{3}

To find the concrete used in the ramp if the cost of concrete is $ 4.00 per cubic foot, we need to know the area of the ramp, which is:

S = 4*4 = 16 ft^{2}

Hence, the value of the concrete used is: 16*4 = $64

8 0
3 years ago
Read 2 more answers
2.85 rounded to the nearest hundredth <br> A. 2.861<br> B. 2.849<br> C. 2.842<br> D. 2.805
blagie [28]

Answer:

B) 2.849

Step-by-step explanation:

Given: 2.85 which is rounded to the nearest hundredth place.

To find the number, the thousandth place must be greater than or equal to 5.

Here 2.849 has the thousandth place greater than 5

When we round off 2.849 to the nearest hundredth place, we get

2.85

Therefore, answer is B) 2.849

Hope this will helpful.

Thank you.

5 0
3 years ago
Read 2 more answers
Other questions:
  • HELPPPP Two commuter trains carry passengers between two cities, one traveling
    7·1 answer
  • Bro I cant actually cheat on the MAP testing with brainly <br> XDDD
    7·2 answers
  • HELP PICTURE IS SHOWN
    5·1 answer
  • Needing to find answer for using digits 1 to 9 no more than once to create three fractions that are close but not equal to zero
    8·1 answer
  • Solve the system:<br> 4x-3y=2<br> 16x+9y=15
    8·1 answer
  • What is the image of (-9, 2) after a dilation by a scale factor of 3 centered at the<br> origin?
    11·1 answer
  • For what value of y does 125=(1/25)^y-1
    10·2 answers
  • What is the area of a parallelogram with a height of 6 feet and a base of 10.5 feet?
    13·2 answers
  • Please only answer if you know the correct answer! Will give brainliest and points!
    8·2 answers
  • Complete the chart below.​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!