1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
TEA [102]
3 years ago
12

A chemist needs 90 milliliters of a 25% solution but has only 16% and 43% solutions available

Mathematics
1 answer:
Stels [109]3 years ago
4 0
Let f be amount of 43% and  s be amount of 16%...

s+f=90, f=90-s

(.16s+.43f)/90=.25  using f found above we get:

(.16s+.43(90-s))/90=.25

.16s+38.7-.43s=22.5

-.27s=-16.2

s=60, and since  f=90-s, f=30

So the chemist will need to mix 60ml of 16% solution with 30ml of 43% solution to create 90ml of a 25% solution.








You might be interested in
In ΔPQR, the measure of ∠R=90°, the measure of ∠P=26°, and PQ = 8.5 feet. Find the length of QR to the nearest tenth of a foot.
Vitek1552 [10]

Answer:

3.7feet

Step-by-step explanations

Using the sin rule

A/sin a = B/sin b

Let A = PQ = 8.5feet

B = QR = x feet

a = R = 90°

b = P = 26°

Substitute the values into the Sin rule

8.5/sin90 = x/sin26

8.5×sin 26 = x × sin 90

8.5×0.4383 = x× 1

3.7255 = x

Hence the length of QR to the nearest tenth 3.7feet

5 0
3 years ago
Read 2 more answers
What would be a testable hypothesis for artwork from impressionist era france?
Alex777 [14]
The correct answer is: Proust Was a Neuroscientist<span> by Jonah Lehrer

Science ordinarily applies a reductionist approach. To structure a testable theory that could Additionally make faultlessly retested, simulated constructs would made. This is carried will permit clean analyses Also information about statistically huge correctness. However, the test will be we should constantly make what we’ve discovered et cetera check whether it fits Previously, with the bigger picture of how things worth of effort. Our particular social order regularly imitates this reductionist approach Concerning illustration it may be progressively disjointed, with accentuation on the need will practice. As a rule A large portion researchers don't completely appreciate, understand, alternately worth the human experience Also practically specialists don't completely appreciate, understand, alternately quality those rigors of the experimental technique. [I will concede on this continuum, i might fit additional under the experimental outlook battling on like craftsmanship. ] what i might have been laid open should for perusing Proust might have been An neuroscientist is how frequently all the Workmanship predated science. With watchful investigation under those reality of the human experience there may be extraordinary knowledge under mankind's nature, our senses, and the route our universe meets expectations. Mind blowing specialists intuited the thing that the researchers of the day didn't have confidence alternately Might not yet substantiate. With occasion when science need made up for lost time with the thing that symbolization recently knew, Be that i wonder how regularly this transaction of the two planets might have been acknowledged what's more entryway much speedier we Might have gotten here whether science seen art.
</span>
6 0
3 years ago
Which equation is equivalent to the formula below? <br> Y = A ( X - H) ^2 + K
frozen [14]

Answer:

<em>B. a = y - k/(x-h)² </em>

Step-by-step explanation:

Given the expression y = a (x-h)² + k

First make  a the subject of the formula

Subtract k from both sides

y = a (x-h)² + k

y- k = a (x-h)² + k - k

y - k = a (x-h)²

Divide through by (x-h)²

y - k/(x-h)²  = a

a = y - k/(x-h)²

Hence option B is correct

6 0
3 years ago
Read 2 more answers
An expression to represent ( w increased by 5 )
SashulF [63]

Answer:

W + 5

Step-by-step explanation:

Given a number, W

An increase in W by a constant 5 ; can be expressed as ;

W plus the constant value increase

Hence,

Increase in W by 5 equals ;

W + 5

4 0
3 years ago
Jane has rolled a fair die 7 times and each time has gotten a 3. She says that the probability that she will get a 3 on the next
Alexandra [31]

Answer:

A.No, the probability of getting a 3 on a fair die does not change. It will always be

Step-by-step explanation:

Get a good grade!

8 0
3 years ago
Other questions:
  • Translate the sentence into an equation. Six more than the quotient of a number 5 and 9 equals . Use the variable y for the unkn
    13·1 answer
  • Write the number 7.748 x 10-5 in standard form.
    12·1 answer
  • All angles below are right angles. What is the area of the figure?
    13·1 answer
  • Write the fraction 16/40 in simplest form
    13·1 answer
  • The radius of a circular track is 0.2 mile. Ellie ran around 3 times. How many kilometers did she run
    8·1 answer
  • How to turn repeated decimals into fractions
    5·1 answer
  • Plz help!!! I’ll give 10 points to the first person to give me a correct answer...I need to get my grade up before the end of th
    9·1 answer
  • Can you please help do not understand
    6·1 answer
  • Which function has an x-intercept at (-1,0) and a y-intercept at (0,4)?
    13·1 answer
  • How do I graph this linear function <br> x &lt; -1
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!