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
faust18 [17]
3 years ago
13

And this one. Thank you

Mathematics
1 answer:
vekshin13 years ago
5 0

Answer:

D. 390

Step-by-step explanation:

9(21)+3(3)(21)+12

You might be interested in
Can someone help me please
Xelga [282]

Answer:

8<u>></u>x<u>></u>=4

this is the answer.

4 0
2 years ago
The amount A of the radioactive element radium in a sample decays at a rate proportional to the amount of radium present. Given
slavikrds [6]

Answer:

a) \frac{dm}{dt} = -k\cdot m, b) m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }, c) m(t) = 10\cdot e^{-\frac{t}{2438.155} }, d) m(300) \approx 8.842\,g

Step-by-step explanation:

a) Let assume an initial mass m decaying at a constant rate k throughout time, the differential equation is:

\frac{dm}{dt} = -k\cdot m

b) The general solution is found after separating variables and integrating each sides:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }

Where \tau is the time constant and k = \frac{1}{\tau}

c) The time constant is:

\tau = \frac{1690\,yr}{\ln 2}

\tau = 2438.155\,yr

The particular solution of the differential equation is:

m(t) = 10\cdot e^{-\frac{t}{2438.155} }

d) The amount of radium after 300 years is:

m(300) \approx 8.842\,g

4 0
3 years ago
Read 2 more answers
Due in 30 minutes!!<br><br> Thank you:)
Fynjy0 [20]

Answer:

The 3rd one as it's cubic

8 0
2 years ago
Read 2 more answers
What is the length of TU?
ratelena [41]

Answer:

We can see that both the triangles are congruent to each other.

So, PQ = TU (CPCT), Thus TU = <u>6</u><u>0</u><u>.</u>

3 0
3 years ago
Read 2 more answers
HELP I will give brainliest to make the perfect shade of orange cake frosting, Mya needs 8 drops of yellow food coloring for eve
GalinKa [24]
She will need 48 drops of red food coloring
7 0
3 years ago
Read 2 more answers
Other questions:
  • Which property is illustrated by the following statement? . Angle X = Angle Y and Angle Z = Angle Y, so Angle X = Angle Z. A.Sym
    5·1 answer
  • Find the median for the following set of number 5,19,2,28,25
    12·1 answer
  • How many 4-digit numbers which are greater than 5000can be formed using the digits 7,0,5and 4?
    5·2 answers
  • 61/28 + a = 19/4a - 11/7
    8·2 answers
  • Which pair of angles are vertical angles?
    13·1 answer
  • The length is 3 inches more than the width period the width is 2 inches more than the height. The volume is 120 in.³. What is th
    5·1 answer
  • A child's sandbox is 5 feet wide, 4 feet long, and 3 feet deep. Grace fills the sandbox so that the sand is 2 ½ feet deep. What
    8·1 answer
  • Can you please tell me what subtotal is?
    15·1 answer
  • An environmentalist tracks the total number of trees y in a park after x years of a planting program. The line of best fit for t
    12·1 answer
  • For the function f(x) = -3x + 2, what is the local
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!