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
harkovskaia [24]
3 years ago
9

Megan has already saved $18 and she earns $4 per hour working four hours on each Saturday and 3 hours on each Sunday. Rhoni has

already saved $22 and she earns $3 per hour and works 6 hours each week. If they combine their money, in how many weeks will they be able to afford a $316 stereo?
Mathematics
1 answer:
seraphim [82]3 years ago
6 0
In one week Megan makes 28 dollars 
In one week Rhoni makes 18 dollars
Combined per week they make 46 dollars
you do 316/46
Which equals <span>6.86956521739
Basically in 7 weeks they can buy the stereo
</span>

You might be interested in
Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains liters of a dye solution with a
Alja [10]

Answer:

t = 460.52 min

Step-by-step explanation:

Here is the complete question

Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 liters of a dye solution with a concentration of 1 g/liter. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 liters/min, the well-stirred solution flowing out at the same rate.Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value.

Solution

Let Q(t) represent the amount of dye at any time t. Q' represent the net rate of change of amount of dye in the tank. Q' = inflow - outflow.

inflow = 0 (since the incoming water contains no dye)

outflow = concentration × rate of water inflow

Concentration = Quantity/volume = Q/200

outflow = concentration × rate of water inflow = Q/200 g/liter × 2 liters/min = Q/100 g/min.

So, Q' = inflow - outflow = 0 - Q/100

Q' = -Q/100 This is our differential equation. We solve it as follows

Q'/Q = -1/100

∫Q'/Q = ∫-1/100

㏑Q  = -t/100 + c

Q(t) = e^{(-t/100 + c)} = e^{(-t/100)}e^{c}  = Ae^{(-t/100)}\\Q(t) = Ae^{(-t/100)}

when t = 0, Q = 200 L × 1 g/L = 200 g

Q(0) = 200 = Ae^{(-0/100)} = Ae^{(0)} = A\\A = 200.\\So, Q(t) = 200e^{(-t/100)}

We are to find t when Q = 1% of its original value. 1% of 200 g = 0.01 × 200 = 2

2 = 200e^{(-t/100)}\\\frac{2}{200} =  e^{(-t/100)}

㏑0.01 = -t/100

t = -100㏑0.01

t = 460.52 min

6 0
3 years ago
PLEASE HELP! SEE THE IMAGES BELOW! 30 POINTS
Mkey [24]

Answer:

d for the first and c for the second

Step-by-step explanation:

1. both are solid lines so it is or equal to something. the first line is going down by -3 and crosses the y axis at -3 so it is _>_ - 3x-3

the second line is going down at -1/2 and crosses the y axis at 2 so it is       _<_ -1/2x+2


2. The point where the two lines cross is at (2.5, -6.5)

6 0
3 years ago
A railroad crew can lay 5miles of track each day. They need to lay 135 miles of track. The length, l (in miles), that is left to
torisob [31]
What is the function
4 0
2 years ago
Find the dimensions of a closed right circular cylindrical can of smallest surface area whose volume is 128pi cm^3
Ratling [72]
The surface area of a cylindrical can is equal to the sum of the area of two circles and the body of the cylinder: 2πr2 + 2πrh. volume is equal to π<span>r2h.

V = </span>π<span>r2h = 128 pi
r2h = 128 
h = 128/r2

A = </span><span>2πr2 + 2πrh
</span>A = 2πr2 + 2πr*(<span>128/r2)
</span>A = 2πr2 + 256 <span>π / r
</span><span>
the optimum dimensions is determined by taking the first derivative and equating to zero.

dA = 4 </span>πr - 256 <span>π /r2 = 0
r = 4 cm
h = 8 cm
</span><span>

</span>
4 0
2 years ago
Which statement is true?
riadik2000 [5.3K]

Answer:

D

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • 4y -3 Please help me
    5·1 answer
  • Pair of correspnding angles
    5·1 answer
  • Please help me best answer gets brainliest
    13·1 answer
  • You need to ride an average of at least 25 miles per day for five consecutive
    10·1 answer
  • ((Picture) CONVERGENT AND DIVERGENT SERIES PLEASE HELP!!
    14·1 answer
  • Find the circumference of the circle. Use 3.14 for . Round to the nearest hundredth,.12.5 in. The circumference of the circle is
    15·1 answer
  • NEED ANSWERED NOW
    10·1 answer
  • I WILL GIVE BRAINLIEST TO WHOEVER ANSWERS BOTH!<br><br> :))
    9·2 answers
  • Find the missing side lengths.<br><br> Can someone please help???
    10·1 answer
  • Case 1: Jackson is a recent college graduate who just got his first job. He commutes approximately 35 minutes each way to his ne
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!