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2 years ago

Y= 2x -1 2x + 3y =13

Mathematics

1 answer:

Molodets [167]2 years ago

5 0

Step-by-step explanation:

Check the image above dear.....

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EXPAND it please and explain <br> (9r-s/7)(9r+s/7)

Mars2501 [29]

Answer:

2. 2

81r - s/49

Step-by-step explanation: I don’t know how to explain it but yeah

( I’m probably wrong so if I am I’m sorry)

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3 years ago

It is a week before the maths festival. A maths exhibitor costs £75.40 and so far 12 have been bought.

Tasya [4]

Answer:

Hello,

£75.40*12= 904.8£

Step-by-step explanation:

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3 years ago

Professor Harris is teaching a continuing education class at the local community college. He created the following box plot from

inessss [21]

Answer:

Step-by-step explanation:

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3 years ago

Alicia had - $11.00 in her

lana [24]

Answer:

$42

Step-by-step explanation:

It's $42 because 11+44.50 is 54.50 and then you take out 6.25 twice because it's her and one friend to get 42 dollars. Hope this helps!

7 0

2 years ago

Geometric Series assistance

Levart [38]

we have been asked to find the sum of the series

$\sum _{n=1}^5\left(\frac{1}{3}\right)^{n-1}$

As we know that a geometric series has a constant ratio "r" and it is defined as

$r=\frac{a_{n+1}}{a_n}=\frac{\left(\frac{1}{3}\right)^{\left(n+1\right)-1}}{\left(\frac{1}{3}\right)^{n-1}}=\frac{1}{3}$

The first term of the series is $a_1=\left(\frac{1}{3}\right)^{1-1}=1$

Geometric series sum formula is

$S_n=a_1\frac{1-r^n}{1-r}$

Plugin the values we get

$S_5=1\cdot \frac{1-\left(\frac{1}{3}\right)^5}{1-\frac{1}{3}}$

On simplification we get

$S_5=\frac{121}{81}$

Hence the sum of the given series is $\frac{121}{81}$

5 0

2 years ago