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rosijanka [135]
2 years ago
9

Friday night 289

Mathematics
2 answers:
PIT_PIT [208]2 years ago
7 0
412 + 162 + 347 = 921. Because it is closer to 900 than 1,000, the answer is 900.
enot [183]2 years ago
4 0
Round up or down then add 
412=400
162=200
347=400
add your new numbers up and u get 1000
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How do u solve 5x+3=4 <br> Y=-3x
kogti [31]
The information from the first equation gives you the information needed for the second. To solve the first equation you must rearrange the equation to isolate X. In order to do that you can first move the 3 to the other side of the equation by subtracting it from both sides (5x + 3 - 3 = 4 - 3) and then simplify that to (5x = 4 - 3) and further to (5x = 1). Then to move the 5 you must divide both sides by 5 so you get (5x/5 = 1/5) which can be simplified to (x = 1/5)

From this you can use the X value and input it into the second equation
Y = -3(1/5) and then solve for Y.

Hope this helps!
6 0
3 years ago
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3 years ago
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tino4ka555 [31]
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7 0
3 years ago
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Which polyhedron has more faces than an octahedron but fewer faces than an icosahedron? A. Hexahedron B. Cube C. Tetrahedron D.
DaniilM [7]
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8 0
3 years ago
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10x+4y+ 12z=120 <br> 11x +77y =220 <br> 8x +2y +32z =160
Damm [24]

Answer:

x=8.94 ; y = 1.58; z=2.02

Step-by-step explanation:

solve 10x+4y+12z = 120      →          5x+2y+6z = 60

         8x + 2y +32Z = 160   →           4x+y+16z = 80

To eliminate z multiply first equation by 16 and second equation by 6.

80x+32y+96z = 960

24x+6y+96z =   480

on subtractionwe get 56x+26y = 480

dividing by 2 we get, 28x + 13y = 240

Now we have a given equation 11x + 77y = 220 → x + 7y = 20

solving 28x + 13y = 240 and x + 7y = 20

28x + 13y =240

28x + 216y = 560

subtracting we get, 203y = 320

y = 1.58

x = 8.94

z = 2.02

6 0
3 years ago
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