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3 years ago

Can someone plzzzzzz help me with the second problem which is talking about mattress plzzz I really need help!!!

Mathematics

2 answers:

Bingel [31]3 years ago

7 0

Answer: I would help but too blurry

Step-by-step explanation:

Svetllana [295]3 years ago

5 0

Answer:

you have to give me brainlieast since i gave you free points

Step-by-step explanation:

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The depth of a lake is 1,400 meters.What is the depth in kilometers?

lina2011 [118]

1.4km 1000 meters is equal to 1 kilometer

8 0

4 years ago

Read 2 more answers

A cup of coffee contains about 100 mg of caffeine. Caffeine is metabolized and leaves the body at a continuous rate of about 12%

Mamont248 [21]

Answer:

a. $A = C_{0}(1-x)^t\\x: percentage\ of \ caffeine\ metabolized\\$

b. $\frac{dA}{dt}= -11.25 \frac{mg}{h}$

Step-by-step explanation:

First, we need tot find a general expression for the amount of caffeine remaining in the body after certain time. As the problem states that every hour x percent of caffeine leaves the body, we must substract that percentage from the initial quantity of caffeine, by each hour passing. That expression would be:

$A= C_{0}(1-x)^t\\t: time \ in \ hours\\x: percentage \ of \ caffeine\ metabolized\\$

Then, to find the amount of caffeine metabolized per hour, we need to differentiate the previous equation. Following the differentiation rules we get:

$\frac{dA}{dt} =C_{0}(1-x)^t \ln (1-x)\\\frac{dA}{dt} =100*0.88\ln(0.88)\\\frac{dA}{dt} =-11.25 \frac{mg}{h}$

The rate is negative as it represents the amount of caffeine leaving the body at certain time.

3 0

3 years ago

7th Grade Math<br> Please help<br> -7 = 1/3 a<br> Find the value of a

julsineya [31]

Answer:

$\huge\boxed{a=-21}$

Step-by-step explanation:

$-7=\dfrac{1}{3}a\to\dfrac{1}{3}a=-7\qquad|\text{multiply both sides by 3}\\\\3\!\!\!\!\diagup\cdot\dfrac{1}{3\!\!\!\!\diagup}a=(-7)(3)\\\\a=-21$

4 0

3 years ago

What are the x-intercepts of x^2– 3x = 4?

Sindrei [870]

Answer:

x^2-3x=4

x^2-3x-4=0

x^2-4x+x-4=0

x(x-4)+1(x-4)=0

(x+1)(x-4)=0

x=-1,4

x- intercepts in the point (-1,0) and (4,0)

Step-by-step explanation:

3 0

4 years ago

Harry and John share £60 in the ratio of 2: 1 work out how much money Harry gets

krek1111 [17]

Answer:

Step-by-step explanation:

3u-> 60

1u-> 20

2u->40

6 0

3 years ago