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kvasek [131]
3 years ago
13

Solve the equation. 1/7a + 3/4 = 9/8

Mathematics
1 answer:
dlinn [17]3 years ago
5 0

Answer:

its already solved

Step-by-step explanation:

u solved.it already

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X-y+z=-4<br><br> 3x+2y-z=5<br><br> -2x+3y-z=15<br><br> How do I solve this?
Lera25 [3.4K]
1)\ \ \ x-y+z=-4\ \ \ \Rightarrow\ \ \ z=-4-x+y\\\\2)\ \ \ 3x+2y-z=5 \\.\ \ \ \  \Rightarrow\ \ 3x+2y-(-4-x+y)=5 \\.\ \ \ \  \Rightarrow\ \ 3x+2y+4+x-y=5 \\.\ \ \ \  \Rightarrow\ \ 4x+y=1\\\\3)\ \ \ -2x+3y-z=15\\.\ \ \ \  \Rightarrow\ \ -2x+3y-(-4-x+y)=15\\.\ \ \ \  \Rightarrow\ \ -2x+3y+4+x-y=15\\.\ \ \ \  \Rightarrow\ \ -x+2y=11\\--------------------\\

z=-4-x+y\\.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ and\\ \left \{ {{4x+y=1\ \ \ \ } \atop {-x+2y=11\ /\cdot4}} \right. \\\\\left \{ {{4x+y=1\ \ \ \ } \atop {-4x+8y=44}} \right. \\-------\\y+8y=1+44\\9y=45\ /:9\\y=5\\\\-x+2y=11\ \ \ \Rightarrow\ \ \ x=2y-11\ \ \ \Rightarrow\ \ \ x=2\cdot5-11=-1\\\\z=-4-x+y=-4-(-1)+5=-4+1+5=2\\\\Ans.\ x=-1\ \ \ and\ \ \ y=5\ \ \ and\ \ \ z=2
5 0
3 years ago
What is 6 squared ÷2(3)+4
julsineya [31]
6^{2} /2*3 +4 \\ 36/2*3+4 \\ 18*3+4 \\ 54+4 \\ 58
Hope this helps!
7 0
3 years ago
What is the square root of 169
BARSIC [14]
If you multiply 13 to itself you get 169

so the square root is 13
4 0
3 years ago
Read 2 more answers
A quadratic equation is shown below: 9x2 − 16x + 60 = 0
Oksanka [162]
9x^2 - 16x + 60
Find the discriminant, b^2 - 4ac, which is the same as the value of the radicand.
(-16)^2 - 4 * 9 * 60 = -1904
Since the discriminant is negative, there will be NO real solutions, and 2 complex solutions.

Part B.
4x^2 + 8x - 5 = 0
You can tell if a quadratic is factorable if you find the discriminant and it is a perfect square. The discriminant for this quadratic is 144 so it is factorable.
(2x + 5)(2x - 1) = 0
Set each factor equal to zero.
2x + 5 = 0                                                    2x - 1 = 0
subt 5 from both sides                                add 1 to both sides
2x = -5                                                        2x = 1
divide both sides by 2                                divide both sides by 2
x = -5/2 <span>                                                     </span>  x = 1/2
7 0
2 years ago
Write each number in scientific notation.<br> 1) 0.0279<br> 2) 0.00007100<br> 3)0.0000005060
mariarad [96]

Answer:

1.) 2.79 × 10^-2

2.) 7.100 × 10^-5

3.) 5.060 × 10^-7

Step-by-step explanation:

Hope this helped.

4 0
3 years ago
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