Use a system of equations to solve this problem.
a chemist currently has two solutions of sodium chloride. one solution has a 5% concentration and the other has a 25% concentration. the chemist needs to make 10 l of a 10% sodium chloride solution.
let x = the amount of 5% solution.
let y = the amount of 25% solution.

how much of each solution does the chemist need to make?
enter your answers, as decimals, in the boxes.
l of 5% solution

l of 25 % solution

The 7.5  L of 5% solution and 2.5 L of 25 % solution .

Step-by-step explanation:

As given

A chemist currently has two solutions of sodium chloride.

One solution has a 5% concentration and the other has a 25% concentration.

The chemist needs to make 10 L of a 10% sodium chloride solution.

Let x = the amount of 5% solution.

Let y = the amount of 25% solution.

Than first equation becomes

x + y = 10

5% is written in the decimal form .

= 0.05

25% is written in the decimal form .

= 0.25

10% is written in the decimal form .

= 0.10

Than the second equations becomes

Concentration of 5% solution × Amount of solution + Concentration of 25% solution × Amount of solution  = Concentration of 10% solution × Amount of solution .

Putting all the values in the above

0.05x + 0.25y = 10 × 0.10

Simplify the equation

5x + 25y = 100

Than two equations are

x + y = 10

5x + 25y = 100

Multiply x + y = 10 by 5 and subtracted from 5x + 25y = 100 .

5x - 5x + 25y - 5y = 100 - 50

20y = 50

y = 2.5 L

Putting the value of y in the equation

x + y = 10

x + 2.5 = 10

x = 10 - 2.5

x = 7.5 L

Therefore the 7.5  L of 5% solution and 2.5 L of 25 % solution .

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560

step-by-step explanation:

use context clues to figure out the meaning of the bolded word:  

the sage gardener knew when she had to water her plants.  

question 8 options:

mint plant

wise

happy

lazy