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
12345 [234]
3 years ago
6

How did the temperature change if: at first it decreased by 60% and then increased by 80%. PLEASE NEED HELP!

Mathematics
1 answer:
Sergio039 [100]3 years ago
5 0

The temperature decreased by 28%

Step-by-step explanation:

How did the temperature change if :

  • At first it decreased by 60%
  • Then increased by 80%

Assume that the temperature before decreasing is 100%

∵ The temperature before decreasing = 100%

∵ It decreased by 60%

→  Before decreasing  :  decreasing  :    after decreasing

→  100%                         :  60%              :    100% - 60% = 40%

∴ The temperature after decreasing = 40%

Assume that the temperature after decreasing is 100%

∵ The temperature after decreasing = 100%

∵ It increased by 80%

By using the ratio method

→  After decreasing  :  increasing  :    after increasing

→  100%                      :  80%             :   100% + 80% = 180%

→  40%                        :                       :   x%

By using cross multiplication

∴ 100% × x% = 40% × 180%

- Divide both sides by 100%

∴ x% = \frac{(40)(180)}{100}

∴ x% = 72%

∵ At first the temperature = 100%

∵ At last the temperature = 72%

∵ The first the temperature > the last the temperature

∴ The decreasing in temperature = 100% - 72% = 28%

The temperature decreased by 28%

Learn more:

You can learn more about ratio in brainly.com/question/2707032

#LearnwithBrainly

You might be interested in
What is the correct domain and range in set notation?
Svetlanka [38]

DOMAIN: [0, +6)

RANGE: (-2.5, +2.5)

REMEMBER THAT THE DOMAIN IS SET ACCORDING TO THE GRAPH’S RELATION TO THE X-AXIS (-X, +X).

REMEMBER THAT THE RANGE IS ISET ACCORDING TO THE GRAPH’S REALTION TO THE Y-AXIS (-Y, +Y).

REMEMBER THAT THE BEST WAY TO APPRECIATE THIS AID TO YOUR LEARNING TO MARK “BRAINLIEST”.

5 0
3 years ago
Read 2 more answers
Define democracy?Write any four key elements of democracy. Easy answer required.
umka21 [38]
Democracy: a system of government by the whole population or eligible members of state, typically through elected representatives

elements:
- equality
- accountability
- rule of law
- transparency
6 0
3 years ago
Last month Gianni used 6GB out of the 8GB
zepelin [54]

I would help you but I don’t know

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Determine the range of the following graph:
joja [24]
From -4 to 1 (range equals the y values)
5 0
2 years ago
Suppose a river flows south to north at a velocity of 1 m/s, and a motorboat traverses the river from east to west at a speed of
irina1246 [14]

Answer: 24^{\circ}

Step-by-step explanation:

Given

River is flowing from south to North with a velocity of u=1\ m/s

Motor boat traverses the river from east to west at a speed of v=2.5\ m/s

South component of boat velocity must compensate the river velocity in order to travel in west direction.

\therefore v\sin \theta=u\\\\\Rightarrow 2.5\sin \theta=1\\\\\Rightarrow \sin \theta=\dfrac{2}{5}\\\\\Rightarrow \theta=23.57^{\circ}\approx 24^{\circ} \text{south of west}

5 0
2 years ago
Other questions:
  • can you figure out what the next five numbers would be in this sequence of numbers? 1,6,7,12,14,19,22
    10·2 answers
  • I need this by the end of the hour please help my Geometry brainliest plus 50 points...
    13·2 answers
  • 12-w=1 solve for w help me please
    15·1 answer
  • X/5 + 7 = 16 X= answer​
    8·2 answers
  • What's the sum of all number from 1 to 2022
    8·1 answer
  • The figures below are similar. The labeled sides are corresponding.
    14·1 answer
  • -2-(-7)= help me pls.
    5·2 answers
  • Expand the following. In other words, remove the parentheses (brackets):
    11·1 answer
  • It says “If 4 apples cost $1.00, what would be the cost of 10 apples?” -
    7·2 answers
  • PLEASE HELP<br> How does the distributive property relate to factoring expressions?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!