answer.
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
olasank [31]
2 years ago
8

Joshua is doing a chemistry experiment that calls for a 30% solution of copper sulfate. He has 40ml of 25% solution. How many mi

llimeters of 60% solution should joshua add to obtain the required 30% solution?
Mathematics
1 answer:
Sholpan [36]2 years ago
8 0

Answer:

6 2/3 mL

Step-by-step explanation:

Multiply thru by 100 to get:

1000 + 60x = 30*40 + 30x

30x = 200

x = 6 2/3 mL (amt. of 60% solution needed in the mixture)

You might be interested in
How many leap years occur between the<br> years 1700 and 1875?
Zina [86]

Step-by-step explanation:

A leap year occurs every 4th year.

So, 1875 - 1700 = 175

Now let us divide 175 by 4

175 \div 4 = 43.75 \\  here \: 43 \: represents \: the \: number \: of \:  \\ leap \: years.

So, 43 leap years occur between the years 1700 and 1875.

6 0
2 years ago
7 girls audition for 12 roles in a school play. What is the probability that at least 2 of the girls audition for the same part?
Sophie [7]

Answer:

Step-by-step explanation:

This is one minus the probability that all the girls audition for different roles. The total number of ways of assigning roles to the girls is 12^7, because to each of the 7 girls, you have a choice of 12 roles.

Then if each girl is to receive a different role, then there are 12!/5! possibilities for that. If you start assigning roles to the girls, then for the first girl, there are 12 choices, but for the next you have to choose one of the 11 different ones, so 11 for the next, and then one of the 10 remaining for the next etc. etc., and this is 12*11*10*...*6 = 12!/(12-7)! =12!/5!

The probability that a random assignment of one of the 12^7 roles would happen to be one of the 12!/5! roles where each girl has a different role, is

(12!/5!)/12^7 = 12!/(12^7 5!)

Then the probability that two or more girls addition for the same part is the probability that not all the girls are assigned different roles, this is thus:

1 - 12!/(12^7 5!)

6 0
2 years ago
The cafeteria director at Great Minds School wants to know what percent of the students would choose vegetarian entrees if they
Korvikt [17]

Answer:

Sort a list of the students into a random order, then ask the first 353535 students on the list.

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Which best describes the graph of the cubic function f(x) = x3 + x2 + x + 1?
EleoNora [17]

Answer:

Option A

Step-by-step explanation:

  • f(x) = x³ + x² + x + 1

This is increasing function

The first option is correct

<em>See attached graph for reference</em>

3 0
2 years ago
Huixian needs to pack 171 pens, 63 pencil, and 27 erasers into identical bags so that each item is equally distributed among the
luda_lava [24]

Answer:

87 gift bags

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
Other questions:
  • Helena uses a mixture of compost and topsoil in her garden. She purchased a total of 10 cubic yards of compost and topsoil for $
    10·2 answers
  • One square has an area that is 10 cm2 larger than another. What is a reasonable domain for the area of the larger square?
    9·2 answers
  • In the figure above, two line segments in the x-y plane form a right triangle with the x-axis. What is the area of the triangle
    13·1 answer
  • There are 2000 pounds in a ton how can you write 2000 with and exponent
    8·2 answers
  • A company purchased equipment and signed a 7-year installment loan at 9% annual interest. The annual payments equal $9,000. The
    5·2 answers
  • A single ticket to the magic show costs ttt dollars, but there is a discount of 5\%5%5, percent per ticket if a group buys 10101
    7·2 answers
  • In Quebec, 90 percent of the population subscribes to the Roman Catholic religion. In a random sample of eight Quebecois, find t
    7·1 answer
  • Classify the number 85 in as many groups on the Venn diagram as possible. A) rational B) irrational C) rational, integer D) rati
    10·1 answer
  • Amber is trying to solve 3x^2-4x=0 using a graphical method. She therefore starts by drawing the graph of y=3x^2 on a grid she n
    13·2 answers
  • Hakim is making a mosaic
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!