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MA_775_DIABLO [31]

3 years ago

11

Jeff's net monthly income is $2550. His monthly expense for rent is $625. What percent of his net monthly income is his rent? (R

ound your answer to the nearest whole percent.)

1 answer:

kakasveta [241]3 years ago

3 0

Answer:

25%

I cannot really describe how I did it but I am pretty sure it is correct.

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A cold drink is poured out at 52°F. After 2 minutes of sitting in a 72°F room, its temperature has risen to 55°F. Find an equati

I am Lyosha [343]

Answer:

The model for the temperature of the drink can be written as

$T=72-20e^{-0.08t}$

Step-by-step explanation:

For a cold drink in a hotter room, we can say that the rate of change of temperature of the drink is proportional to the difference of temperature between the drink and the room.

We can model that in this way

$\frac{dT}{dt}=k*(T_r-T)$

If we rearrange and integrate

$\int\frac{dT}{(T-Tr)} =-k*\int dt\\\\ln(T-T_r)=-kt+C1\\\\T-T_r=Ce^{-kt}\\\\T=T_r+Ce^{-kt}$

We know that at time 0, the temperature of the drink was 52°F. Then we have:

$T=T_r+Ce^{-kt}\\\\52=72+Ce^0=72+C\\\\C=-20$

We also know that at t=2, T=55°F

$T=T_r+Ce^{-kt}\\\\55=72-20e^{-k*2}\\\\e^{-k*2}=(72-55)/20=0.85\\\\-2k=ln(0.85)=-0.1625\\\\k=0.08$

The model for the temperature of the drink can be written as

$T=72-20e^{-0.08t}$

7 0

4 years ago

Plz help me get the answer right

Jobisdone [24]

Three of the points that are on the graph are

(-1.38,2.05)= y=11+5x/2
(0,5.5)= y-intercept, (0,11/2)
(-2.2,0)= x-intercept, (-11/5,0)

8 0

3 years ago

Determine the range of the following graph:

sergeinik [125]

Answer:

-7 < y < 2 (Line under <) is the answer

6 0

2 years ago

Zoey needs at least $30 to buy a gift. She has $12. What inequality could Zoey use to find out how much more money (m) she needs

Vika [28.1K]

The sign she would use would be $\geq$

5 0

3 years ago

Read 2 more answers

Jung has a total of 92 coins in his coin collection. This is 8 more then 3 times the number of quarters in the collection. How m

andre [41]

Answer:

28

proof:

28*3= 84

92-84= 8

5 0

3 years ago