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3 years ago

7

The price of a calculator has decreased from

2 answers:

leva [86]3 years ago

6 0

im pretty sure its b 25 percent

NeTakaya3 years ago

4 0

Decrease = New number - Original Number

% Decrease = $\frac{Decrease}{Original~number}$ × 100

Decrease = 9 - 12 = -3

% Decrease = $\frac{-3}{12}$ = -0.25 × 100 = -25

Your answer = -25

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How many milliequivalents of sodium chloride are contained with 3 L of normal saline?

AVprozaik [17]

Answer:

466mEq

Step-by-step explanation:

First, we need to know the concentration of NaCl in a normal saline solution, this is by definition 0.9%, meaning we have 0.9g of NaCl per 100ml of solution, we want to know how much NaCl we have in 3L (3000ml):

$3000ml*\frac{0.9g}{100ml}=27g=27000mg$

So, we have 27000mg in 3L of normal saline solution.

Now, acording to our milliequivalent (mEq) equation ( $mEq=\frac{mg}{pE}$ ) where pE is de molecular mass of NaCl divided by their charges, in this case 1:

$pE= \frac{23+35}{1}=\frac{58}{1} = 58$

Finally we substitute in the mEq formula:

$mEq=\frac{mg}{pE}=\frac{27000}{58}=466mEq$

I hope you find this information useful! Good luck!

4 0

3 years ago

Wendy and Joyce had the same amount of money. Wendy spent $960 while Joyce spent $2,500. In the end, Wendy had 3 times as much m

julia-pushkina [17]

Each of them started with $4620 at first

7 0

3 years ago

The length of a rectangle is 11 in. longer than its width. the perimeter of the rectangle is 86 in.write and solve an equation t

Tcecarenko [31]

I hope this helps you

width w

length w+11

perimeter =2 (width +length )

86=2 (w+w+11)

43=2w+11

32=2w

w=16

length = w+11=16+11=27

6 0

3 years ago

35 degrees - 45 degrees

love history [14]

Answer:

-10 degrees

Step-by-step explanation:

5 0

3 years ago

14. Write a two-column proof.

scZoUnD [109]

Given:

$\bold{ 8x=4y-20} \\\\ \bold{ y=13}$

Prove:

$\bold{x=4}$

Solution:

$\to \bold{8x=4y-20}..........(i)\\\\\to \bold{ y=13}........................(ii)$

Putting the value of equation (ii) into the equation (i):

$\to \bold{8x=4(13)-20}\\\\\to \bold{8x=52-20}\\\\\to \bold{8x=32}\\\\\to \bold{x=\frac{32}{8}}\\\\\to \bold{x= 4}\\\\$

putting the value x into the equation (i):

$\to \bold{8(4)=4y-20}\\\\\to \bold{32=4y-20}\\\\\to \bold{32+20=4y}\\\\\to \bold{52=4y}\\\\\to \bold{y=\frac{54}{4}}\\\\\to \bold{ y= 13.5}$

Therefore, the value of x= 4

Learn more:

brainly.com/question/6219408

3 0

3 years ago