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Keith_Richards [23]
3 years ago
13

Find the missing value. 2 cookies $3.00 4 cookies X

Mathematics
2 answers:
sergiy2304 [10]3 years ago
3 0
6 dollars because if 2 is equal to 300 dollars just double it to get 6 dollars
Veseljchak [2.6K]3 years ago
3 0

Answer:

$6.00

Step-by-step explanation:

2 cookies = $3.00

Double the cookies, double the money

4 cookies = $6.00

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Rafael is burning a CD for Selena. The CD will hold 35 minutes (2100 seconds) of music. Which songs should he select from the li
Andreyy89

Answer:

d,e,i,f,c,g,a

Step-by-step explanation:

You want all of the smallest numbers so you can fit the most. I hope this helped

7 0
3 years ago
John makes 44,000 a year. if he gets a 3% raise how much will he make the next year?
Lena [83]

Answer: D. $45,320

Step-by-step explanation:

Simply multiply 44,000 by 0.003 and add that to 44,000!

5 0
3 years ago
A pharmacist wants to mix a 30% saline solution with a 10% saline solution to get 200 mL of a 12% saline solution. How much of e
Bess [88]

Answer:

30% constituents=20 mL

10% constituents=180 mL

Step-by-step explanation:

x= 30% volume

y=10% volume

For our first equation, we know the total volume is 200 mL and is the sum

x+y=200

y=200-x (1)

For our second equation, we do a mass balance for 200 mL of final solution.

12% w/v = 0.12 g/mL

This means that in 1 mL of solution, we have 0.12 g of NaCl.

For any solution, concentration multiplied by volume will give the mass of NaCl:

Mass in x mL= C*V (g/mL) (mL)

So in 200 mL, we have

0.12*200 (g/mL) (mL)

=24g of NaCl

Cx*Vx + Cy*Vy=24

0.3x+0.1y=24 (2)

Substitute y=200-x into (2)

0.3x+0.1(200-x)=24

0.3x+20-0.1x=24

0.2x=24-20

0.2x=4

Divide both sides by 0.2

0.2x/0.2=4/0.2

x=20

Substitute x=20 into (1)

y=200-x

y=200-20

y=180

30% constituents=20 mL

10% constituents=180 mL

6 0
3 years ago
Perform the operation.<br> (-x^2 – 1) – (-2x^2 – 4)
ivolga24 [154]

Answer:

Okay!

Step-by-step explanation:

I have simplified the operation, and I got x^2 + 3.

If you wanted me to evaluate, the answer is still  x^2 + 3.

If you wanted me to subtract then the answer is again,  x^2 + 3.

Basically the answer is  x^2 + 3.

Have a good day!

6 0
3 years ago
What is 3a squared add 7 a
vfiekz [6]
The answer is:  " 9a² + 7a " .
_________________________________
Note:    (3a)² + 7a = (3a)*(3a) + 7a = 9a² + 7a .
_________________________________
3 0
3 years ago
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