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geniusboy [140]
3 years ago
9

Solve by using substitution: y = 2x - 5 and y = 5x + 7 *

Mathematics
1 answer:
faltersainse [42]3 years ago
4 0

Answer:

x = -4, y = -13

Step-by-step explanation:

2x - 5 = 5x + 7

3x = -12

x = -4

Y = 2(-4)-5 = -13

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F(×)=3×/2+× find f(-4)​
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Answer:

f(x)=6

Step-by-step explanation:

3(-4)/2+(-4)

-12/-2

f(x)=6

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3 years ago
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At a school with 100 students, 40 students are taking Arabic, 35 Bulgarian, and 25
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A no students are taking all 3 languages
B 41 students are taking no language sorry if I’m wrong have a great day
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A. k/5 = 3; k=<br> B. 3.5d = 70; d=<br> C. 4 1/2 = 1 1/2n; n=<br><br> Solve each equation.
Kryger [21]

Answer:

Step-by-step explanation:

A. k/5 = 3:  Isolate k by multiplying both sides of this equation by 5:

k = 15

       

B. 3.5d = 70;  Divide both sides by 3.5, obtaining d = 20

C. 4 1/2 = 1 1/2n;   Rewrite 4 1/2 and 1 1/2 as improper fractions:

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8 0
3 years ago
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Which graph best represents the relationship between KE and speed?
JulijaS [17]

Answer: b

Step-by-step explanation: d can’t be the correct answer because it is talking about speed .... speed can’t be graphed like that....

C..... is the other way so a is better answer

However, b is the best answer because speed always starts slow then goes fast....

I hope this helps, I am not the best..... but I hope it can maybe help u in some way :)

Also, I will respond if u tell me what KE is .... then i can tell you a more accurate answer

But b is the best answer

4 0
3 years ago
Find the number of rectangles in 8×8 chessboard. (not just the 1x1 squares)
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Answer:

288

Step-by-step explanation:

<em>                                             Number of rectangles</em>

<em>____________________________________________________________</em>

1 × 1 squares 9-1 = 1 = 8*8 = 64

1 × 2 squares 9-2 = 7 = 8*7 = 56

1 × 3 squares 9-3 = 6 = 8*6 = 48

1 × 4 squares 9-4 = 5 = 8*5 = 40

1 × 5 squares 9-5 = 4 = 8*4 =32

1 × 6 squares 9-6 = 3 = 8*3 = 24

1 × 7 squares 9-7 = 2 = 8*2 = 16

1 × 8 squares 9-8 = 1 = 8*1 = 8

64 + 56 + 48 + 40 + 32 + 24 + 16 + 8 = 288

<em>Thus,</em>

<em>the number of squares on a chessboard is 228.</em>

<em />

<em>Hope this helps :)</em>

8 0
3 years ago
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