The first thing you should do is do everything in parenthesis.
So lets start:
(2*4) = 8
(3*55) = 165
(2+7) = 9
Now we add and subtract the numbers:
8 + 165 - 9 = 164
So that means that the answer is 164.
Hope this helps!!! :)
Answer:
x=15
Step-by-step explanation:
-3x+33=-12
-3x=-12-33
-3x=-45
x=-45/-3
x=45/3
x=15
Answer:
9 to the 3 power is 729
Step-by-step explanation:
Answer:
This problem is a great systems of equations problem--you have two different variables: song size and number of songs.
Let's call the number of standard version downloads (S) and the high quality downloads (H).
You can make two statements:
For number of songs downloaded: S + H = 910
For download size: 2.8(S) + 4.4(H) = 3044.
S will be the same number in both equations and H will be the same number in both equations, so to find S, we can rearrange the first statement to H = 910 - S, then substitute or plug in (910 - S) wherever you see an H in the second equation so that you have only S's in your equation. Should look like this:
2.8(S) + 4.4(910 - S) = 3044
2.8S + 4004 - 4.4S = 3044
-1.6S = -960
s = 600
Your question only asks for the standard version downloads, but to help you out in future Systems situations-
You can also solve for H once you have S by plugging it into either of your equations like this:
600 + H = 910
-600
H=310
Step-by-step explanation:
hope it help
*comment if my answer is wrong*
<span>This is somewhat similar to something called Cramer's Rule http://www.1728.org/cramer.htm
A) 3x – 7y = 25
a =3 b=-7 e=25
B) 5x – 8y = 27</span>
c=5 d=-8 f=27
dn = |a b |
|c d |
dn = |3 -7|
|5 -8
dn = (3*-8) -(5*-7)
dn = -24 +35
dn = 11
x = |e b|
|f d|
divided by dn
x = |25 -7|
|27 -8|
divided by dn
x = -200 -(-189) / 11
x = -11 / 11
x = -1
y = |a e |
|c f |
divided by dn
y = |3 25|
|5 27|
divided by dn
y = 81 -125 / dn = -44 / 11 =-4
