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
FrozenT [24]
4 years ago
9

How do you properly make a science fair board

Chemistry
2 answers:
aalyn [17]4 years ago
7 0
Get a poster board and find a project and make sure it looks neat and creative I would add pictures and some color
Andreas93 [3]4 years ago
4 0
Get a poster board print out the information and add some pictures
You might be interested in
The sum of the first 10 terms of an arithmetic progression is 120 and the sum of first twenty is 840. find sum of first 30 terms
STatiana [176]

Answer:

The sum of first 30 terms of the arithmetic progression is <u>2160.</u>

Explanation:

For an arithmetic progression, the sum of first n terms with first term as a and common difference d is given as:

S_n=\frac{n}{2}(2a+(n-1)d)

Now, it is given that:

For\ n=10,S_n=120\\For\ n=20,S_n=840

Now, plug in these values and frame two equations in a\ and\ d

S_{10}=\frac{10}{2}(2a+(10-1)d)\\120=5(2a+9d)\\2a+9d=\frac{120}{5}\\2a+9d=24------------1

S_{20}=\frac{20}{2}(2a+(20-1)d)\\840=10(2a+19d)\\2a+19d=\frac{840}{10}\\2a+19d=84-----------2

Now, we solve equations (1) and (2) for a\ and\ d. Subtract equation (1) from equation (2). This gives,

2a+19d-2a-9d=84-24\\19d-9d=60\\10d=60\\d=\frac{60}{10}=6

Now, plug in the value of d=6 in equation (1) and solve for a.

2a+9(6)=24\\2a+54=24\\2a=24-54\\2a=-30\\a=\frac{-30}{2}=-15

Plug in the values of a=-15,\ n=30\ and\ d=6 in the sum formula to find the sum of first 30 terms.

Now, the sum of first 30 terms is given as:

S_{30}=\frac{30}{2}(2(-15)+(30-1)(6))\\S_{30}=15(-30+29(6))\\S_{30}=15(-30+174)\\S_{30}=15(144)=2160

Therefore, the sum of first 30 terms of the arithmetic progression is 2160.

4 0
3 years ago
How do plants and animals help to maintain a balance of carbon dioxide in the air?
Rom4ik [11]
The process of photosynthesis in plants releases oxygen into the atmosphere. Respiration by plants and animals, as they use the energy stored in food, and the process of decomposition of dead organisms, releases carbon dioxide into the atmosphere. All three work together to maintain the carbon dioxide-oxygen cycle.
5 0
3 years ago
PLS HELP ASAP NO LINKS WILL MARK BRAINLIEST IF CORRECT
patriot [66]

Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.

Explanation:

6 0
3 years ago
Read 2 more answers
10. How do liquid water,ice, and water vapor differ from one another?
musickatia [10]
A) They are different states of matter.
6 0
3 years ago
Read 2 more answers
Which claim about cats is most likely based on science?
MrRissso [65]

Answer:D

Explanation:

4 0
3 years ago
Other questions:
  • An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81
    8·1 answer
  • Describe how the charges of the subatomic particles interact with one another.
    7·2 answers
  • What is a orgasm that kills and eats other orgasms for food called?
    15·2 answers
  • Atomic theory is
    12·1 answer
  • The force generated by charged objects is called:
    8·2 answers
  • 4. What is the percent yield of a reaction that produces 12.5 g CF2Cl2 from 32.9 g of CCl4 and excess HF
    13·1 answer
  • Week 4 learning task 1 science 4th quarter​
    14·1 answer
  • What happens to algae when the temperature in the ocean becomes too hot?
    11·1 answer
  • How many molecules of water vapor participate in the above reaction if 90 g of water vapor are available?
    12·1 answer
  • A 5g piece of aluminum foil (c=0.897) at 100°C is dropped into a 25g container of water (c=4.184) at 20°C. What is the final tem
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!