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Allushta [10]
3 years ago
15

Verify that( a+b)+c=a+(b+c) where a=-1/2 b=3/4 c=5/7​

Mathematics
1 answer:
mojhsa [17]3 years ago
6 0

Step-by-step explanation:

(a + b) + c \\  =   \bigg(-  \frac{1}{2}  +  \frac{3}{4} \bigg ) +  \frac{5}{7}  \\ =   \bigg(-  \frac{2}{4}  +  \frac{3}{4} \bigg ) +  \frac{5}{7}  \\  =    \frac{1}{4} +  \frac{5}{7}  \\   =  \frac{7 + 20}{28}  \\    \red{ \bold{\therefore \: (a + b) + c=  \frac{28}{28}}}...(1) \\  \\ a + (b + c) \\  =  -  \frac{1}{2}  +  \bigg( \frac{3}{4}  +  \frac{5}{7}  \bigg) \\ =  -  \frac{1}{2}  +  \bigg( \frac{21 + 20}{28}   \bigg) \\ =  -  \frac{1}{2}  +   \frac{41}{28}   \\  =  \frac{ - 14 + 41}{28}  \\  \red{ \bold{a + (b + c)  =  \frac{ 27}{28}}}....(2)  \\  \\ from \: equations \: (1) \: and \: (2) \: it \: is \\ obvious \: that:  \\  \:  \:  \: \purple{  \boxed{\bold{ (a + b )+ c = a + (b + c)  }}} \\   \:  \:  \: hence \: verified.

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S=(1 r)<br> c. find c if s = r 174 and r= 45%
stepladder [879]
The question is incorrect because of the apparent contradiction the question makes.
First statement says that a quantity S is equal to quantity r.
The second statement says that S = 174r. 
Moreover, the quantity C is not correctly linked with the equation. Please either correct the question or explain the ambiguity.
4 0
3 years ago
Gina wants to go to the water park with her friends. They have a total of w dollars to buy 5 tickets. Each
geniusboy [140]

Answer:W=5x15

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Step-by-step explanation:

7 0
3 years ago
If the probability of an event is 0.7 repeating​, what are the odds against the​ event
ivann1987 [24]
So the probability is the number of favorable outcomes divided by the number of total outcomes. This means that the favorable outcomes are 7/9, and the unfavorable outcomes are 2/9. The odds against the event are the unfavorable outcomes. Therefore the odds against the event is 2/9, or 0.2 repeating. Hope this helps. Feel free to ask more questions, and feel free to ask questions about my explanation.
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3 years ago
Help me out here guys
kvasek [131]
D.

f(x) can be written as (x+2)(x-2)(x-1)
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3 0
2 years ago
Which table contains the vertex of the graph represented by y=x^2-6x+4?
Vaselesa [24]

vertex = (3,- 5 )

given a quadratic in standard form : y = ax² + bx + c ( a ≠ 0 ), then

the x-coordinate of the vertex is

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with a = 1, b = - 6 and c = 4, hence

x_{vertex} = - \frac{-6}{2} = 3

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vertex = (3, - 5 ) → second table




7 0
3 years ago
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