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andreev551 [17]
3 years ago
5

Siri earns $6 a day for house sitting. She spends $10 to replace a vase she accidentally broke. Alexa has $50 from her birthday

and she spends $4 a day on coffee. How many days, d will it take until the girls have the same amount of money?
Mathematics
1 answer:
Serjik [45]3 years ago
8 0

Answer:

6

Step-by-step explanation:

siri=6x-10

alexa= 50-4x

im making a table which is an easy way to tell or you can guess and check

X       S       A

--------------------

 2     |    2    |42

  3    |   8     |38

   4   |     14   |34

  5    |   20     |30

   6   |     26   |26

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Consider the sequence 8, 14, 20, 26, . . .. (a) What is the next term in the sequence? 2.2 Exercises 98 (b) Find a formula for t
omeli [17]

Answer:

Step-by-step explanation:

Each term of the given arithmetic sequence is 6 more than the previous one.  Thus, the next term is 26+6, or 32.

a(n) = 8 + 6(n-1)

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Brandon has a box 9.5 inches tall, 3.8 inches wide , and 4.2 inches long how many square inches of wrapping paper does he need t
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4 years ago
Find the surface area of the cylinder. Use a ~ 3.14 20 m​
lesantik [10]

Answer:

1444.4 m2

Step-by-step explanation:

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Note .. You can Derive this  

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6 0
3 years ago
a) Suppose that a large mixing tank initially holds 300 gallons of water in which 50 pounds ofsalt have been dissolved. Pure wat
Kay [80]

Answer:

x  =  50*e∧ -t/100

Step-by-step explanation:

We assume:

1.-That the volume of mixing is always constant 300 gallons

2.-The mixing is instantaneous

Δ(x)t   =  Amount in  - Amount out

Amount  =  rate * concentration*Δt

Amount in  =  3 gallons/ min * 0  =  0

Amount out  = 3 gallons/min *  x/ 300*Δt

Then

Δ(x)t/Δt  =  - 3*x/300    Δt⇒0   lim Δ(x)t/Δt  =  dx/dt

dx/dt  =  - x/100

dx/ x  =  - dt/100

A linear first degree differential equation

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Ln (50) = 0/100 * C

C =  ln (50)

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Ln x  =  - t/100  + Ln(50)   or

e∧ Lnx   =  e ∧ ( -t/100 + Ln(50))

x  =  e∧ ( -t/100) * e∧Ln(50)

x  = e∧ ( -t/100) * 50

x  =  50*e∧ -t/100

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