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2 years ago

Work out and simplify where possible7/15+2/15

Mathematics

2 answers:

xxTIMURxx [149]2 years ago

8 0

3/5 is the answer and in decimal form it should be 0.6

alisha [4.7K]2 years ago

6 0

Answer:

3/5

Step-by-step explanation:

7/15 + 2/15 = 9/15

both 9 nad 15 are divisible by 3

9/15 = 3/5

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At the moment a certain medicine is injected, its concentration in the bloodstream is 120 milligrams per liter.

igomit [66]

Answer:

$c(t) = 120 [0.7]^{t}$

Step-by-step explanation:

At the moment a certain medicine is injected, its concentration in the bloodstream is 120 milligrams per liter.

From that moment forward, the medicine's concentration drops by 30% each hour.

Therefore, the medicine concentration c(t) in mg/liters after t hours will be modeled as

$c(t) = c(0) [1 - \frac{30}{100}]^{t}$

⇒ $c(t) = c(0) [1 - 0.3]^{t}$

⇒ $c(t) = 120 [0.7]^{t}$ . (Answer)

7 0

3 years ago

Read 2 more answers

An orange punch is 45% juice and a mango punch is 20% juice. By combining the two, a company is making 500 L of a fruit punch th

AlekseyPX

Answer:

<h2>400 L of orange punch</h2>

Step-by-step explanation:

step one:

given data

orange punch is 45% juice and

mango punch is 20% juice.

amount of fruit punch to be made is

500 L of a fruit punch that is 40% juice.

Let x = the number of liters of orange punch in the fruit punch.

Then the number of liters of mango is 500 - x

The number of liters of orange + mango juice is

0.45x + 0.2(500 - x), and this must equal the number of liters

in the fruit punch, which is 0.4*500

0.45x + 100 - 0.2x = 200

solve for x

0.45x-0.2x+100-200=0

0.25x-100=0

0.25x = 100

x=100/0.25

x = 400 L

<u>400 L of orange punch</u>

6 0

2 years ago

The sum of 33 consecutive even numbers is 78. What is the second number in this sequence?

hjlf

Answer: The second number is 26

Step-by-step explanation:

To solve this problem you must apply the proccedure shown below:

1. Let's call:

x: The first even number.

x+2: the second consecutive even number.

x+4: the third consecutive even number.

2. So, you know that the sum ot the 3 consecutive numbers is 78, therefore, you must add them, as you can see below:

$x+(x+2)+(x+4)=78\\3x+6=78\\3x=78-6\\3x=72\\x=\frac{72}{3}\\x=24$

3. Substitute the value obtain into x+2. Therefore, the second number is:

$x+2=24+2=26$

3 0

3 years ago

–d+7d–2d–8d<br> uhhhhhhhh

AVprozaik [17]

Answer:

if you are trying to solve for <em>d </em>here it is...

2 sin (x) -1 = 0

2x=5

4x=8

Step-by-step explanation:

please give brainliest!

3 0

3 years ago

Read 2 more answers

(5+4-2)×(-2)=<br><img src="https://tex.z-dn.net/?f=%285%20%2B%204%20-%202%29%20%5Ctimes%20%28%20-%202%29" id="TexFormula1" title

Akimi4 [234]

$(5+4-2)\cdot(-2)=7\cdot(-2)=\boxed{-14}$

Hope this helps.

5 0

3 years ago

Work out and simplify where possible7/15+2/15​

Work out and simplify where possible7/15+2/15