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
MrRa [10]
3 years ago
12

9% of 40 is what number?

Mathematics
2 answers:
Mkey [24]3 years ago
5 0

Answer:

3.6

Step-by-step explanation:

Marizza181 [45]3 years ago
4 0

Answer:

3.6

Step-by-step explanation:

(using proportion method)

40 x 9 = 360

100 x <em>C </em>= 100c

360 / 100c = 3.6

You might be interested in
The quantity of soda consumed per week at a soda fountain is 34 liters, with a standard deviation of 5.8 liters. If any 80 weeks
Mama L [17]
5.8/ sqrt 80=0.648 I think you are asking for the standard margin 
Hope this works
3 0
3 years ago
Read 2 more answers
Must a function that is decreasing over a given interval always be negative over that same interval? Explain.
kolbaska11 [484]

Answer:

its called common sense

Step-by-step explanation:divide negative by the positive leaving you with the commomn answer thus its subtraction

5 0
3 years ago
What is the equation of a line that passes through the points `\left(-2\ ,\ 9\right)`and `\left(-4\ ,\ -4\right)`?
Dennis_Churaev [7]

Answer:

y=(5/2)x+14

Use the slope formula and slope-intercept form y=mx+b to find the equation

3 0
3 years ago
A 15 kilogram object is suspended from the end of a vertically hanging spring stretches the spring 1/3 meters. At time t = 0, th
Yuri [45]

Answer:

15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = ± 170 cos(5t)

y(0)=0, y'(0)=0

Step-by-step explanation:

See the attached image

This problem involves Newton's 2nd Law which is: ∑F = ma, we have that the acting forces on the mass-spring system are: F_{r} (t) that correspond to the force of resistance on the mass by the action of the spring and F(t) that is an external force with unknown direction (that does not specify in the enounce).

For determinate F_{r} (t) we can use Hooke's Law given by the formula F_{r} (t) = k y(t) where k correspond to the elastic constant of the spring and y(t) correspond to  the relative displacement of the mass-spring system with respect of his rest state.

We know from the problem that an 15 Kg mass stretches the spring 1/3 m so we apply Hooke's law and obtain that...

k = \frac{F_{r}}{y} = \frac{mg}{y} = \frac{15 Kg (9.81 \frac{m}{s^{2} } )}{\frac{1}{3} m}  = 441.45 \frac{N}{m}

Now we apply Newton's 2nd Law and obtaint that...

F_{r} (t) ± F(t) = ma(t)

F_{r} (t) = ky(t) = 441.45y(t)

F(t) = 170 cos(5t)

m = 15 kg

a(t) = \frac{d^{2}y(t)}{dt^{2} }

Finally... 15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = ± 170 cos(5t)

We know from the problem that there's not initial displacement and initial velocity, so... y(0)=0 and y'(0)=0

Finally the Initial Value Problem that models the situation describe by the problem is

\left \{ 15\frac{d^{2}y(t)}{dt^{2} }  - 441.45y(t) = \frac{+}{} 170 cos(5t) \atop {y(0)=0, y'(0)=0\right.

6 0
3 years ago
You are given the following equation: (x+3)^2 + (y+9)^2 = 144 What is the<br> radius? *
Anettt [7]

Answer:

12

Step-by-step explanation:

(x-h)^2 + (y-k)^2 = r^2 so taking the square root of 144 gives you 12

3 0
3 years ago
Other questions:
  • What is the particular solution of this differential equation 5y'''-y''-6y'=1+x^2
    15·1 answer
  • Combining like terms with negative coefficients &amp; distribution
    12·1 answer
  • HELP NEEDED!! OFFERING 15 POINTS!!
    15·2 answers
  • A coin with a head side and a tail side is flipped 3 times.
    13·2 answers
  • Use the graph that shows the solution to f(x) = g(x).
    5·1 answer
  • A-32=47 what the equation for a
    8·2 answers
  • Why isn't it let me skip to see the answers on my post​
    8·2 answers
  • 7th grade math pls help
    13·1 answer
  • Given P(A)= 0.95 and P(A∩B)=0.37. Find P(B∣A)
    11·1 answer
  • Find the perimeter of the polygon with the vertices U(-2,4), V(3,4) W(3,-4). Round your answer the nearest hundredths
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!