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user100 [1]
3 years ago
13

If 3x – 9 = -2x + 16, then 7x=?

Mathematics
2 answers:
skad [1K]3 years ago
5 0

Answer:

The answer to this problem is x equals 14

Step-by-step explanation:

Tpy6a [65]3 years ago
4 0

Answer:

x= 5 , 7x = 35

Step-by-step explanation:

Well, first we need to find the value of x.

3x - 9 = -2x + 16

3x + 2x = 16 + 9

5x = 25

x = 5

So, we just need to multiple it by 7

x = 5

7x = 7*5

7x = 35

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GuDViN [60]

Answer:

angle l = 115

angle k = 115

angle j = 114

angle i = 66

Step-by-step explanation:

angle l = it is opposite to 115 so its the same

angle k = opposite opposing angles with angle l

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4 0
1 year ago
An airplane travels 6111 kilometers against the wind in 9 hours and 7911 kilometers with the wind in the same amount of time. Wh
natima [27]

Answer:

Speed of the plane in still air: 779\; {\rm km \cdot h^{-1}}.

Windspeed: 100\; {\rm km \cdot h^{-1}}.

Step-by-step explanation:

Assume that x\; {\rm km \cdot h^{-1}} is the speed of the plane in still air, and that y\; {\rm km \cdot h^{-1}} is the speed of the wind.

  • When the plane is travelling against wind, the ground speed of this plane (speed of the plane relative to the ground) would be (x - y)\; {\rm km \cdot h^{-1}}.
  • When this plane is travelling in the same direction as the wind, the ground speed of this plane would be (x + y)\; {\rm km \cdot h^{-1}}.

The question states that when going against the wind (v = (x - y)\; {\rm km \cdot h^{-1}},) the plane travels 6111\; {\rm km} in 9\; {\rm h}. Hence, 9\, (x - y) = 6111.

Similarly, since the plane travels 7911\; {\rm km} in 9\; {\rm h} when travelling in the same direction as the wind (v = (x + y)\; {\rm km \cdot h^{-1}},) 9\, (x + y) = 7911.

Add the two equations to eliminate y. Subtract the second equation from the first to eliminate x. Solve this system of equations for x and y: x = 779 and y = 100.

Hence, the speed of this plane in still air would be 779\; {\rm km \cdot h^{-1}}, whereas the speed of the wind would be 100\; {\rm km \cdot h^{-1}}.

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1 year ago
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Answer:

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Step-by-step explanation:

5.6 x 5.6 x 6.16 x 6.16=1189.974016

Rounded up will be 1190.

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Answer:

45 ?

Step-by-step explanation:

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