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Romashka-Z-Leto [24]
3 years ago
8

Im kind of confused What am i supposed to do?

Mathematics
1 answer:
Elis [28]3 years ago
7 0

Club A:   25+30x   where x is the number of lesson

Club B   55 + 20x where x is the number of lesson

when is the cost equal

25+ 30x = 55 + 20x

subtract 20 x from each side

25+ 30x -20x = 55 - 20x

25+ 10x = 55

subtract 25 from each side

25-25+ 10x = 55 - 25

10 x = 30

divide by 10

10x/10 = 30/10

x = 3

After 3 lessons the cost is equal

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A or B or C or D which expression??​
zhenek [66]

Answer:

option A

Step-by-step explanation:

Notice that you need to emulate the series: 1 + 5 + 25 + 125 + 625 (a five total term series)

with the indicated sums.

The first term in the your series (addition) has to be "1". This fact already gets rid of two of the suggested sums (B, and D) because their first term is 5^1=5.

So, now analyzing the options A and C, we notice that A has a sum from i=0 to 4 (which gives a total of five terms ao, a1, a2, a3, and a4, while option C has a total of six terms (from i = 0 to 5): a0, a1, a2, a3, a4, a5.

S, the obvious candidate is option A. So now evaluate the five terms corroborating that:

5^0 + 5^1+5^2+5^3+5^4=\\=1+5+25+125+625

Therefore, option A is the answer

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3 years ago
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MatroZZZ [7]

Answer:

5−x²+2xy−y²

Step-by-step explanation:

5 - (x-y)²

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5−((x−y)(x−y))

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5−(x(x−y)−y(x−y))

Apply the distributive property

5−(x⋅x+x(−y)−y(x−y))

Apply the distributive property

5−(x⋅x+x(−y)−yx−y(−y))

Simplify and combine like terms  

Simplify each term

5−(x²−xy−yx+y²)

Subtract yx from −xy  

5−(x²−2xy+y²)

Apply the distributive property

5−x²−(−2xy)−y²

Multiply  −2 by −1

5−x²+2xy−y²

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