help me please !!!!!!!!!

I ONLY NEED HELP ON THE FIRST QUESTION SHOWN

Helga [31]

I think the answer should be C , h=A/b

8 0

3 years ago

To reduce 16 ounces of a 25% solution of antiseptic to a 10% solution, how much distilled water should a nurse add?

yan [13]

Answer:

24 ounces

Step-by-step explanation:

Here's a more intuitive approach to use here.

You know that your initial solution has a percent concentration, presumably volume by volume, of

25

%

. This means that any volume of this solution contains

1

part solute and

3

parts solvent.

The target solution must have a concentration of

10

%

, which means that any volume of this solution will contain

1

part of solute and

9

parts solvent.

Your starting solution has a volume of

16

ounces, or

4

parts, each with a volume of

4

ounces.

In order to get to a solution that has a total of

10

parts, you must add

6

parts of solvent to the initial solution. Since we know that

1 part

=

4 ounces

it follows that you must add

6

parts

⋅

4 ounces

1

part solvent

=

24 ounces

of distilled water, which is your solvent, to the initial solution.

The target solution will contain

1

part solute and

9

parts distilled water for a total of

10

parts of solution, and hence have a percent concentration of

10

%

.

7 0

3 years ago

Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students

Alex17521 [72]

Answer:

85.7

Step-by-step explanation:

Given that two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90.

Section A total score = 15*80=1200

Section B total score 20*90 = 1800

Overall total score=3000

Overall total students = 15+20 =35

Hence overall mean = $\frac{3000}{35} \\=85.7143$

rounding off to one decimal place

overall mean = 85.7

7 0

3 years ago

Workers in an office of 40 staff were asked their favourite type of take-away.

xeze [42]

Answer:

the pie chart is not drawn to scale, its a rough sketch. so please use a protracter to scale yours more accuratly

hope it helps

7 0

3 years ago

Read 2 more answers

Find x- and y-intercepts. Write ordered pairs representing the points where the line crosses the axes. y−3x=18

Radda [10]

Answer:

see explanation

Step-by-step explanation:

Given

y - 3x = 18

To find the y- intercept let x = 0 in the equation and solve for y

y - 3(0) = 18

y - 0 = 18

y = 18 ⇒ (0,18 ) ← y - intercept

To find the x- intercept let y = 0 in the equation and solve for x

0 - 3x = 18

- 3x = 18 ( divide both sides by - 3 )

x = - 6 ⇒ (- 6, 0 ) ← x- intercept

8 0

3 years ago

￼help me please !!!!!!!!!

help me please !!!!!!!!!