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2 years ago

Sara hina and arsalan has rupees 930 if Sara has 7 more than Hina and arsalan has 3 times what sara has how much do they have

Mathematics

1 answer:

Papessa [141]2 years ago

3 0

Answer:

Step-by-step explanation:

Let us represent:

Number of rupees that:

Sara has = x

Hina = y

Arsalan = z

Sara,Hina and arsalan has rupees 930

x + y + z = 930..... Equation 1

if Sara has 7 more than Hina

x = y + 7

y = x - 7

Arsalan has 3 times what sara has

z = 3x

We substitute x - 7 for y and 3x for z in Equation 1

x + y + z = 930..... Equation 1

x + x - 7 + 3x = 930

5x - 7 = 930

5x = 930 + 7

5x = 937

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In the expansion (ax+by)^7, the coefficients of the first two terms are 128 and -224, respectively. Find the values of a and b

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Answer:

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Step-by-step explanation:

Expanding $(ax+by)^7$ using Binomial expansion, we have that:

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We have that the coefficients of the first two terms are 128 and -224.

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For the second term:

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$b = \frac{-224}{a^6}$

$b = \frac{-224}{2^6} \\\\\\b = \frac{-224}{64} \\\\\\b = 3.5$

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