Answer:
84
Step-by-step explanation:
Order of operations is PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction)
= (52 + 6) - (7 * 4) + 8
work inside parentheses first
= 58 - 28 + 8
work left to right now
= 30 + 8
= 38
SONYA'S MISTAKE
= (52 + 6) - (7 * 4) + 8
I think she added the 52, 6+4, multiplied 7*4 to equal 28, then added the 6+8 to equal 14
= 52 + 28 + 14 + 10
= 104
ANSWER: 38
Hope this helps! :)
Answer:
Step-by-step explanation:
40% of the regular price
subtracting it from
10% off each
(not sure of the last one)
Answer:
3
Step-by-step explanation:
![2x+5y=-4 \\ 4x-5y=22](https://tex.z-dn.net/?f=2x%2B5y%3D-4%20%5C%5C%204x-5y%3D22)
There are many ways of solving a system of equation, a very used one is by elimination of variables, which consists in eliminating one of the variables by combining the equations.
Let's do the following combination: (eq 1) + (eq 2)
This means that we add each term vertically:
![2x+5y=-4 \\ 4x-5y=22](https://tex.z-dn.net/?f=2x%2B5y%3D-4%20%5C%5C%204x-5y%3D22%20)
⇒
![6x=18](https://tex.z-dn.net/?f=6x%3D18)
When I said "add vertically" means that you add the first term of the first equation with the first term of the second equation. The second term of the first equation with the second term of the second equations, and so on.
This allowed us to remove the "y" temporarily so we can get a linear one-variable equation we can easily solve:
![6x=18 \\ x=3](https://tex.z-dn.net/?f=6x%3D18%20%5C%5C%20x%3D3)
Now that we know the value of "x", we can plug it in any of the starting equations and get "y":
![2x+5y=-4 \\ 2(3)+5y=-4 \\ 5y=-10 \\ y=-2](https://tex.z-dn.net/?f=2x%2B5y%3D-4%20%5C%5C%202%283%29%2B5y%3D-4%20%5C%5C%205y%3D-10%20%5C%5C%20y%3D-2)
Therefore, our answer looks like this: