12. A chemist has 40 mL of a solution that is 50% acid. How much water should he add to make
a solution that is 10% acid?
Total Amount x % Acid = Amount of Acid
Total Amount
% Acid
Amount of Acid
Original Solution
Water
New Solution
Answer:
Volume of pure Acid in -50- LITRES of the solution= 10- litres. Let “V”- litres of water be added, then
Therefore 10= (50+ V) x8/100 .
So 10= 4 + 8V/100
8V/100 = 10–4= 6
So V= 6 x 100/8= 600/8= 75- LITRES.
So on adding 75- litres of water to the acid solution, the percentage of acid drops to 8% .
Check: Percentage of acid in 125- LITRES of acid solution, which contain 10- LITRES if pure Acid
= 10/125 x 100= 8% .
Step-by-step explanation:
The number of kneepads (k) needed for a volleyball team depends on the number of players (p) on the team. Each player needs 2 kneepads. Which of the following are correct representations of this situation? Select all that apply.
Answer:
Look at the circled answers below (I hope its right):
What is the median of this data set?
Answer:
58
Step-by-step explanation:
It is the middle point/dot
in the box with the line
PLS HELP WILL GIVE BRAINLIEST!!!: Researchers once surveyed students on which superpower they would most like to have. The following two-way table displays data for the sample of students who responded to the survey.
How many students in the survey chose to fly as their superpower?
______ students
Image here:
Answer:
38
Step-by-step explanation:
for this table, we can add up all of the students who chose flying (both the "male" and "female" students)
26 + 12 = 38
So, 38 students chose flying as their superpower.
hope this helps!!
Mary has a Garden in which are 3 mango trees,2 papaya tress and 4 avocado tress. How many trees are in her garden??
3 options
10
4
9
Answer:
there are 9 trees
Step-by-step explanation
Answer:
9
Step-by-step explanation:
What is the answer for number 5?
Answer:
2$ a pound
Step-by-step explanation:
I you look closely on the first point its (1,2)
x stands for pounds
y stands for dollars,
the slope is 2/1
(rise over run)
Find the surface area of the square pyramid shown. Label the net to help you.
I have to show work
Answer: 40 inches squared
Labels are in the pictures
Step-by-step explanation:
To find the surface area, find the area of each side.
Square (base) : side * side = 4*4 = 16
Triangle (sides) : (base * height)/2
Assuming each side is a isosceles triangle, the base 4/2 = 2
(2*6)/2 = 12/2 = 6
Since there are 4 triangles, we can multiply 6 by 4 to get the combined area. We then add the area of the square to get the final result.
6*4 + 16 = 24+16 = 40
Hello, please help me with this problem
In a video game, Antonio gained 20 points, lost 25 points, gained 10 points three times, then lost another 15 points.
How many points does Antonio currently have?
Answer:
10
Step-by-step explanation:
First, you subtract 25 from 20, which is -5. Then, multiply 10 by 3, which is 30. Add that to -5. This gives you 25. Finally, subtract 15 from 25, which gives us 10.
Our class voted for class treasurer. There are 20 students in our class. After voting for class treasurer, Billy received 3 times more votes than Keeton. How many votes did Billy receive?
Answer:
billy - 15
keeton - 5
5+15=20, 5•3=15
Plz answer and explain!!! 10 points!!
Answer:
20 square units
Step-by-step explanation:
First you would divide the sqaure into 2 triangles and 1 suqare then you would find the area of those
Find the original price given the total amount and the tip rate. Total amount: $38.35 Tip: 18%
Answer:
The original price is 45.25$
$38.35 + 18% = 45.25$
Solve the problems
9^2
4^3
3^2
2^3
5^2
Answer:
81649825Step-by-step explanation:
hope this helps!
Please help me with this question also
Answer:
84 and £621.6
Step-by-step explanation:
Need answer by today
Answer:
980 feet per minute
Step-by-step explanation:
Plumber 1 charges $50 per hour plus a flat fee of $20.
Plumber 2 charges $60 an hour with no additional fee.
Complete the table and write a system of equations to represent the costs, where h is the number of hours and c is the total cost.
Answer:
H: 0, 1, 2, 3, 4, 5
plumber 1: 20, 70, 110, 160, 210, 260
plumber 2: 0, 60, 120, 180, 240, 300
plumber 1: C = 50h + 20
plumber 2: C = 60h
Please answer as fast as you can. I will pay you
Promise
Answer:
c all real values of x such that x=/ 7
Step-by-step explanation:
15/2...7
if the three dots is one number what are all possibel numbers?
A small theater had 7 rows of 26 chairs each. Workers just removed 9 of these chairs. How many chairs are left?
Answer:
173
Step-by-step explanation:
7 x 26 = 182.
182 - 9 = 173
Answer:
173 chairs are left
Step-by-step explanation:
7*26 = 182
182-9 = 173
Mark as brainliest please!
Aman had to sell his television at a loss of 12%. If the selling price was
Rs.7040, what was its cost price? Explain step by step please.
this is the explanation i hope it will be good
20 points to whoever gets these right!! <3
Answer:
1st one 8/20
Step-by-step explanation:
This figure is made up of two rectangular prisms.
What is the volume of the figure?
Answer:
do you
Step-by-step explanation:
give options???I like your pfp btw
Answer:
10x3=30 6x12x19=1368 1368+30=1398
Step-by-step explanation:
Write −5.8 as a mixed number in simplest form.
Answer:
The decimal 5.8 is read as 5 and 8 tenths. So, it is written as a mixed number 5810.
In simplest form 5810=545.
The same number is converted into an improper fraction as follows. 5 × 5 + 4 = 29. This the numerator of the improper fraction and 5 is the denominator. So, 545=295. Show Answer.
Answer: 5810
Step-by-step explanation:
plsssssssss mark brainlest
HELP! Will give brainliest IF right
Answer:3(24)+3(9)
Step-by-step explanation:
Answer:
3( 8 + 3 )
Step-by-step explanation:
24 + 9
3( 8 + 3 )
Hopefully this helps!
Brainliest please?
you currently have 225$ in your bank account you make withdrawals of 445$ and 30$ and then deposit 90$ what is the balance of the account now? Please thank you so much
Answer: -$160
Step-by-step explanation:
Start with $225
withdrawal means subtract $445
225-445 = - 220
you are now in negatives because you took more than you had
you take out another $30
-220 - 30 = -250 you are even more negative because you took out more
but you deposit, put back $90, means add
-250 +90 = -160 you are still negative because you didn't put back enough
-$160
A cubehas a mass of 9 grams and each side is 3 cm3. What is the density of the sample?
a.0.33 g/mL
b.36g/m
Lc.3g/mLd.18g/mL
(I know this aint math but no one answers science stuff -_-)
middle school problem attached :D
Answer: $638.40
Step-by-step explanation:
45% converted to a decimal is 0.45
0.45 of $1200 = 0.45* $1200 (of in this case means multiply)
0.45 * $1200= $440
Because they said 11% of remaining salary, we have to do:
$1200-$440=$760
Now 11% converted to a decimal is 0.11
5% converted to a decimal is 0.05
So 0.11+0.05
0.11+0.05= 0.16
Now 0.16 *$760=$121.60
Now we find the remaining amount so we subtract: $760-$121.60= $638.40
So our answer is $638.40 left
for each decimal below, find the two integers closest to it.
-12.02
Answer:
-11 and -12 thanks pls mark brailest it would mean a lot
Step-by-step explanation:
Solve this system of equations by using the elimination method. Please help! Thank you! ( ・・)つ♡
Answer: x = 1, y = 2
Step-by-step explanation:
So elimination is basically big subtraction.
instead of subtracting two numbers, your subtracting two equations;
so heres how it works.
We see that both equations have a common term of 4y, and since the signs of the "4y" term are alternating in the equations, (one is a + the other is a -), we can add the equations, which will cancel out the 4y.
(Basically, im saying 4y - 4y = 0)
So:
x + 4y = 9
2x - 4y = -6
+
------------------------
3x + 0 = 3
I hope you see how that works. its just like writing out a sum with numbers.
Anyways, we get 3x = 3, so x = 1, (divide both sides by 3).
Now that we know x, we can plug this value into either of the equations to get y.
ill use the first one:
x + 4y = 9
1 + 4y = 9
4y = 8
y = 2
And thats it!
x = 1, y = 2
Is this correct? If not, please correct it, and show all work including why it’s wrong.
Answer:
a. 12
b. 1/2
Step-by-step explanation:
Given a meal has 3 choices of meat, 2 choices of fruit, and 2 choices of dessert, you want to know the number of possible meals, and the probability of a meal with no cookie for dessert.
a. PossibilitiesAs the tree diagram shows, the number of possible meals is ...
(possible meats)×(possible fruits)×(possible desserts)
= 3×2×2 = 12
There are 12 possible lunch options.
b. CookiesHalf the possible dessert choices have no cookie. That is the probability that a lunch will have no cookie:
P(no cookie) = 1/2
__
Additional comment
The bottom line of the tree diagram has 6 Cs and 6 Ms. That is, 6 of the 12 options for meals have no cookie.
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PLS HELP ASAP (in link) 15 points!!
Answer:
go to the website slader . com for answers go to your book and page number and you got the answers
Step-by-step explanation: