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Ira Lisetskai [31]
3 years ago
10

How is the following worked out? 9 x 9 + 9 / 9 - 9 =

Mathematics
2 answers:
aleksley [76]3 years ago
6 0
Following PEMDAS, it states that you should start with parenthesis first. In this case, there are none, so you find exponents. Again, there isn't any, so you move onto multiplication. And yes, there is. 
Although, keep in mind that if there is multiplication and division, you don't ALWAYS do multiplication first. If there is both multiplication and division just start from the left to the right. 
1) So, the first step to solving this problem is taking 9 x 9 which is 81.
2) The second step would be skipping over to the division and solve 9/9 which is 1. 
3) Now, your equation is 81 + 1 - 9 = 
4) The fourth step to solve this equation is follow pemdas and solve. PEMDAS states that you do addition before subtraction. Although, if there is addition and subtraction at the same equation just go from left to right. 
5) 81 + 1 - 9 = 82 - 9 = 73

The answer would then be 73.
Sladkaya [172]3 years ago
5 0
Start from the beginning 9 x 9 is 72
72 + 9 is 81 Then 81 divide by 9 which is 9 then 9 - 9 Is 0
So the answer to that is 0 hope i helped! :) 
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3 years ago
Help Please 20 POINTS <br> Which expressions are equivalent to the following?
o-na [289]

Answer:

\large\boxed{5x(6x-x-2)}\\\\\boxed{-5(-6x^2+x+2)}\\\\\boxed{5(2x+1)(3x-2)}

Step-by-step explanation:

30x^2-5x-10=5(6x^2-x-2)=5(-1)(-6x^2+x+2)=-5(-6x^2+x+2)\\\\30x^2-5x-10=30x^2+15x-20x-10=15x(2x+1)-10(2x+1)\\\\=(2x+1)(15x-10)=(2x+1)(5)(3x-2)=5(2x-1)(3x-2)

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Step-by-step explanation:

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3 years ago
Joe walked four over nine of a mile in four over five of an hour. What is his unit rate in miles per hour?
Irina-Kira [14]
<span>four over nine of a mile in four over five of an hour 

= 4                      4
-----       /           ----
  9                       5

</span>= 4                      5
-----      *           ----
  9                       4

= 20
-------
   36

= 5
-----
   9

answer is : <span>four ninths over four fifths = five over nine mile per hour (first choice)</span>
8 0
3 years ago
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