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masya89 [10]
3 years ago
5

Thirty students in a science class each perform the same experiment that involves measuring the temperature of a solution. Which

will provide the most valid inference about the temperature of the solution?
averaging the temperatures measured by the six students with the highest scores on the last science test
averaging the temperatures measured by five students who always work together as a lab team
с
averaging the temperatures measured by five class members whose names were picked from a stack of shuffled cards
D
averaging the temperatures measured by the first six class members who enter the classroom the day after the experiment
Mathematics
1 answer:
marshall27 [118]3 years ago
7 0

Answer:

the answer to you question is C

Step-by-step explanation:

if this helps lmk and have a brilliant day :D

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If x+y= 15, y+z=25, and x+z=20, what is the arithmetic mean of x,y, and z
Mama L [17]
X + y = 15
Rearrange this to isolate for x.
x = 15 - y


x + z = 20
Rearrange this to isolate for x also.
x = 20 - z

Since they are both equal to x, that means they are equal to each other (x = x)

Set them equal to each other. 

15 - y = 20 - z
Now, isolate for y.

y = 15 - 20 + z

Now, use y + z = 25 and isolate for y.
y = 25 - z

Since they are both equal to y, we set them equal to each other.

15 - 20 + z = 25 - z
Solve for z
z + z = 25 - 15 + 20
2z = 30
2z/2 = 30/z
z = 15

Now you can plug the value for z into the other equations to find y and x.

x + z = 20
x +15 = 20
x = 20-15
x = 5

y + z = 25
y + 15 = 25
y = 25 - 15
y = 10

6 0
3 years ago
You are constructing deck chairs that require 12 2/3 feet of lumber each. How many feet of lumber will you use to make 15 chairs
Mrrafil [7]
As each chair needs 12.6667 feet lumber.So 15 chairs will need 15*12.6667=190.0005 lumber
5 0
3 years ago
An enclosed gas exerts a pressure P on the walls of a container. This pressure is directly proportional to the temperature T of
tatyana61 [14]
Don't know if i'm right but I got 1/60

5 0
3 years ago
Read 2 more answers
Given that f(–2.4) = -1 and f(-1.9) = -8, approximate<br> f'(-2.4).<br> f'(-2.4)
lora16 [44]

Answer:

f'(-2.4) ≈ -14

General Formulas and Concepts:
<u>Algebra I</u>

Coordinate Planes

  • Coordinates (x, y)

Slope Formula: \displaystyle m = \frac{y_2 - y_1}{x_2 - x_1}

Functions

  • Function Notation

<u>Calculus</u>

Differentiation

  • Derivatives
  • Derivative Notation

Step-by-step explanation:

*Note:

The definition of a derivative is the slope of the <em>tangent</em> <em>line</em>.

<u>Step 1: Define</u>

<em>Identify.</em>

f(-2.4) = -1

f(-1.9) = -8

<u>Step 2: Differentiate</u>

Simply plug in the 2 coordinates into the slope formula to find slope <em>m</em>.

  1. [Derivative] Set up [Slope Formula]:                                                           \displaystyle f'(-2.4) \approx \frac{f(x_2) - f(x_1)}{x_2 - x_1}
  2. Substitute in coordinates:                                                                           \displaystyle f'(-2.4) \approx \frac{-8 - -1}{-1.9 - -2.4}
  3. Evaluate:                                                                                                       \displaystyle f'(-2.4) \approx -14

---

Learn more about derivatives: brainly.com/question/17830594

---

Topic: AP Calculus AB/BC (Calculus I/I + II)

Unit: Differentiation

6 0
2 years ago
A container has 2 ½ cups of juice in it.
Marat540 [252]

Answer: 57/40 or 1 17/40

Step-by-step explanation: 2 1/2 - 3/8 = 17/8 or 2 1/8        

17/8 or 2 1/8 - 7/10 = 57/40 or 1 17/40

6 0
3 years ago
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