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
vodka [1.7K]
3 years ago
14

See if you can put these inventions in the correct order, most recent to oldest!

Mathematics
2 answers:
SCORPION-xisa [38]3 years ago
7 0

Answer:

Electric TV, Airplane, Refrigerator, Computer, Steel

Step-by-step explanation:

stiv31 [10]3 years ago
7 0

Answer:

Electric TV, Airplane, Steel, Refrigerator, Mechanical Computer

Step-by-step explanation:

According to google:

Airplane (1903)

Steel (1850s)

Electric TV (1927)

Mechanical Computer (1822)

Refrigerator (1834)

You might be interested in
In need help to answer this question ​
andrezito [222]

Answer:

1 6/7

Step-by-step explanation:

1 & 6/7

6 0
3 years ago
Read 2 more answers
Rationalize the denominator of sqrt -49 over (7 - 2i) - (4 + 9i)
zubka84 [21]
\sqrt{ \frac{-49}{(7-2i)-(4+9i) } } 


This one is quite the deal, but we can begin by distributing the negative on the denominator and getting rid of the parenthesis:

\frac{ \sqrt{-49}}{7-2i-4-9i}

See how the denominator now is more a simplification of like terms, with this I mean that you operate the numbers with an "i" together and the ones that do not have an "i" together as well. Namely, the 7 and the -4, the -2i with the -9i.
Therefore having the result: 

\frac{ \sqrt{-49} }{3-11i}

Now, the \sqrt{-49} must be respresented as an imaginary number, and using the multiplication of radicals, we can simplify it to \sqrt{49}  \sqrt{-1}
This means that we get the result 7i for the numerator.

\frac{7i}{3-11i}

In order to rationalize this fraction even further, we have to remember an identity from the previous algebra classes, namely: x^2 - y^2 =(x+y)(x-y)
The difference of squares allows us to remove the imaginary part of this fraction, leaving us with a real number, hopefully, on the denominator.

\frac{7i (3+11i)}{(3-11i)(3+11i)}

See, all I did there was multiply both numerator and denominator with (3+11i) so I could complete the difference of squares.
See how (3-11i)(3+11i)= 3^2 -(11i)^2 therefore, we can finally write:

\frac{7i(3+11i)}{3^2 - (11i)^2 }

I'll let you take it from here, all you have to do is simplify it further.
The simplification is quite straightforward, the numerator distributed the 7i. Namely the product 7i(3+11i) = 21i+77i^2.
You should know from your classes that i^2 = -1, thefore the numerator simplifies to -77+21i
You can do it as a curious thing, but simplifying yields the result:
\frac{-77+21i}{130}
7 0
3 years ago
What is 2 3/12 minus 1 8/12 equal to?​
ArbitrLikvidat [17]

Answer:

7/12

Step-by-step explanation:

3/12=1/4

2 1/4=9/4

8/12=2/3

1 2/3=5/3

---------------

9/4-5/3=27/12-20/12=7/12

6 0
3 years ago
Read 2 more answers
AABC ~ AQRS
Mademuasel [1]

Answer:

m=21

Step-by-step explanation:

based on the dilation from 'ABC' to 'QRS' (which is 3) m should =21

hope this helps! :)

3 0
3 years ago
15.5 × [(2 × 2.4) + 3.2] – 16
ch4aika [34]

Answer:

108

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Write a number that has the same value as 5.132* 10^8
    15·2 answers
  • 3 Look at the table below. which equation could be used to show the relationship between x and y?
    9·1 answer
  • Write the Taylor Series for f(x) = sin(x)center
    8·1 answer
  • Please help me!!!!!!!!!!!!!!
    9·1 answer
  • Absolute value equation|3x] = 9​
    14·1 answer
  • Given the Functions<br>f(x)=-2x+8<br>g(x)=6x-10<br>Which of the following is true.<br>​
    12·1 answer
  • Mrs berry was riding a bicycle on a path. After riding 2/3 of a mile , she discovered that she still needed to travel 3/4 of a m
    9·1 answer
  • What the freak is this 4^(x)-2^(x+1)=48
    5·2 answers
  • I am actually in 4th grade but anyway I need see ​
    5·1 answer
  • Find the L.C.M of the given pair of numbers using the prime factors method. 70 and 84​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!