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2 years ago

3(k - 5) + 9k 2-3 does anyone know how to solve this?

Mathematics

1 answer:

Damm [24]2 years ago

5 0

Answer:

=21k-18

Step-by-step explanation:

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What is nine divided by five and one fourths

blsea [12.9K]

The answer is 1.7142

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3 years ago

Read 2 more answers

1. A box of fruit has 12 plums and 15 bananas. The

sukhopar [10]

Answer:

12p x (15 x 25) I might not be correct :')

3 0

3 years ago

Read 2 more answers

(1 point) Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference betw

slavikrds [6]

Answer:

a. $\frac{dT}{dt}=k(T-Tm); T(0)=190$

b. $C_{0}=122$

c. $k=-0.00259$

d. $t=153.39838\\$ minutos

Step-by-step explanation:

a. Newton's law of cooling states that the speed with which a body is cooled is proportional to the difference between its temperature and that of the medium in which it is found. Then, the initial value problem is given by:

$Tm=68$

$\frac{dT}{dt}=k(T-Tm); T(0)=190$

b. The differential equation obtained is a differential equation of separable variables:

$\frac{dT}{T-Tm}=kdt\\\\\int {\frac{dT}{T-Tm}}=\int{kdt}\\\\Ln|T-Tm|=kt+C\\\\T(t)=C_{0}e^{kt}+Tm=C_{0}e^{kt}+68\\\\T(0)=C_{0}e^{k(0)}+68=190\\\\C_{0}=122$

c. After 33 minutes of serving the coffee has cooled to 180°:

$T(33)=122e^{33k}+68=180\\\\e^{33k}=\frac{112}{122}\\\\33k=Ln(\frac{112}{122})\\\\k=-0.00259$

$150=122e^{-0.00259t}+68\\\\Ln(\frac{150-68}{122})=-0.00259t\\\\t=153.39838\\\\$

8 0

3 years ago

There were 90 runners just start a race in the first half of the race 1/3 of them dropped out in the second half of the race 1/5

Eva8 [605]

Answer:

6 runners finished the race

Step-by-step explanation:

it starts with 90 runners. then 1/3 of them dropped out in the second half of the race, that means you do 90 divided by 3

90 ÷ 3 = 30

Then, 1/5 of the runners remained.

That means you do 30 divided by 5

30÷ 5= 6

so the answer is 6 remaining runners finished the race.

8 0

2 years ago

Add - (remember only like terms can be combined when add/subtract)<br><br> (3x + 5) + (2x - 8)

Afina-wow [57]

Answer:

5x-3

Step-by-step explanation:

(3x + 5) + (2x - 8)

3x+5+2x-8

Bringing the like terms together,

3x+2x+5-8

5x-3

7 0

2 years ago