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
nika2105 [10]
3 years ago
6

What is 30-9x2*2-21-4+4

Chemistry
1 answer:
IgorC [24]3 years ago
5 0
Answer:
9 (1-2x²)

Explanation:
The given expression is:
30 - 9x²*2 - 21 - 4 + 4
The first step is to compute the multiplication. This will give:
30 - 18x² - 21 - 4 + 4
Then, we will add like terms as follows:
(30-21-4+4) - 18x²
= 9 - 18x²
Finally, we can take the 9 as a common factor from both terms, this will give:
9 (1-2x²)

Hope this helps :)

You might be interested in
In a hospital, oxygen is administered to patients at 3.0 atm in a hyperbaric oxygen chamber. Oxygen gas, measuring 600.0 L, is c
atroni [7]

Answer: ifkkk

Explanation:

5 0
3 years ago
Pablo's experiments confirm the relationship between pressure and the number of gas molecules. as the pressure in a system incre
horrorfan [7]
The correct answer is:  [C]:  
___________________________________________________________
          "<span>pressure and the number of gas molecules are directly related."
___________________________________________________________
<u>Note</u>:  The conclusion was: "</span> as the pressure in a system increases, the number of gas molecules increases" — over the course of many trials.
          This means that the "pressure" and the "number of gas molecules" are directly related.

Furthermore, this conclusion is consistent with the "ideal gas law" equation:

     " PV = nRT " ; 
____________________________________________________________
in which:

    "P = Pressure" ; 
    "n = number of gas molecules" ; 
___________________________________________________________
        All other factors held equal, when "n" (the "number of gas molecules") 
 increases in value (on the "right-hand side" of the equation), the value for "P" (the "pressure" — on the "left-hand side" of the equation), increases.
___________________________________________________________
6 0
3 years ago
Read 2 more answers
Rolls of foil are 302 mm wide and 0.018 mm thick. (The density of foil is 2.7 g/cm3 .)
Kruka [31]

Answer:

The length of foil will be 8107.81 cm or 81.7081 m.

Explanation:

Given data:

Width of roll of foil = 302 mm

Height or thickness = 0.018 mm

Density of foil = 2.7 g/cm³

Mass of foil = 1.19 Kg

Length of foil = ?

Solution:

d = m/ v

v = length (l) × width (w) × height (h)

First of we will convert the Kg into gram and mm into cm.

one Kg = 1000 g

1.19 × 1000 = 1190 g

one cm = 10 mm

302 / 10 = 30.2 cm

0.018 / 10 =  0.0018 cm

Now we will put the values in formula:

d = m/ l× h× w

l = m / d × h× w

l = 1190 g / 2.7 g/cm³× 30.2 cm × 0.0018 cm

l = 1190 g/ 0.146772 g/cm

l = 8107.81 cm or 81.7081 m

3 0
3 years ago
Sandy puts a paper clip on the table. Then, she puts a magnet near the paperclip. The paperclip begins to move.
Akimi4 [234]
Applied forces/or unbalanced:i hope that helps you
3 0
3 years ago
Read 2 more answers
Which of the following is a true for subtropical jet streams​
vodka [1.7K]

Answer: how do we answer when there are no options??

Explanation:

5 0
3 years ago
Other questions:
  • Determine how many grams of sodium phosphate would be needed to prepare 455 ml of a 2.50% (m/v) sodium phosphate solution
    12·1 answer
  • What are the potential problems for nearby water sources when using nuclear energy? Check all that apply.
    6·2 answers
  • Rising magma pushes on the crust above it, which can cause ground
    12·1 answer
  • Which number is the subscript in the following formula?<br><br> 2Li3N4-<br><br> - 2<br> - 3<br> - 4
    8·1 answer
  • Laura jala un trineo una distancia de 2000 cm usando una cuerda, con una tensión constante de 80 N. La tarea requiere de 800 J d
    14·1 answer
  • If I add wheels to a cart to move it, will it have more or less friction than trying to
    11·1 answer
  • How does evelyn hear music?​
    7·1 answer
  • Which statement describes the process of wind erosion?
    13·1 answer
  • True or False-- Siblings (brothers and sisters) may or may not have the same combination of traits.
    13·2 answers
  • What would be the vital capacity be for a man that has a tidal volume of 500mL, a residual volume of 1100 mL, an expiratory rese
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!