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Aneli [31]
3 years ago
7

Eighteen students brought their signed

Mathematics
1 answer:
swat323 years ago
3 0

Answer:

30

Step-by-step explanation:

18 divided by 6 is 3. If there is all ready 6 tenths, that means there is 4 left. so, 3 times 4 is 12. And 12 plus 18 is 30.

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Solve by completing the square? Could you please work it out step-by-step?
DaniilM [7]
16 n^2 -10n + 129 = 8n^2 -8

We collect the terms:
8n^2 -10n + 137 = 0

The steps for completing the square:

1) Move the "non X" (or "non N") term to the right:

8n^2 -10n  = -137

<span>2)<span> Divide the equation by the coefficient of N² which in this case is 8
n^2 -1.2n = </span></span><span><span>-17.125 </span>

3) Take the coefficient of "N"; divide it by 2; square it; add it to both sides of the equation.
-1.2 / 2 = -.6
-.6^2 = .36

</span>
n^2 -1.2n +.36 = <span>-17.125 +.36

Take the square root of both sides:</span>
(n-.6)*(n-.6) = sq root( <span> <span> <span> -16.765 </span> </span> </span> )
That's about as far as I can go.

4 0
4 years ago
Solve by substitution<br> -4x+y=6<br> -5x-y=21
inn [45]

Answer:

x=-3, y=-6. (-3, -6).

Step-by-step explanation:

-4x+y=6

-5x-y=21

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

-9x=27

x=27/-9

x=-3

-5(-3)-y=21

15-y=21

y=15-21

y=-6

7 0
3 years ago
Which of the following rational functions is graphed below? ​
Shalnov [3]
You didn’t put your whole question so I can’t help sorry :(((((((((((
4 0
3 years ago
Ol
kogti [31]

Answer:

16

Step-by-step explanation:

no \: of \: girls =  \frac{4}{5 + 4}  \times 36 \\  \\  =  \frac{4}{9}  \times 36 \\  \\  = 4 \times 4 \\  \\  = 16

6 0
3 years ago
Read 2 more answers
Graph the system of equations. {x−y=64x+y=4
Fantom [35]
X-y=6 Equation 1
x+y=4 Equation 2

To graph the given system of equation, first find x and y-intercept of each equation.
x-y=6
When y=0
x=6  Point is (6,0)
When x=0
-y=6
y=-6  Point is (0,-6)

Now x-intercept and y-intercept for equation 2.
x+y=4
When x=0
y=4  Point is (0,4)
When y=0
x=4 Point is (4,0)

Now plot these points on the graph, the lines intersect each other at point (5,-1), which is the solution of the given system.

Answer: (5,-1)

5 0
4 years ago
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