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3 years ago

11

Why can you use cross products to solve the proportion StartFraction 18 over 5 EndFraction = StartFraction x over 100 EndFractio

n for x?

2 answers:

shtirl [24]3 years ago

4 0

45
djekdkdkfkfkktkffk

polet [3.4K]3 years ago

3 0

Answer:

45

Step-by-step explanation:

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Find the sum of series 4/(4n-3) (4n+1)

ANTONII [103]

$\dfrac4{(4n-3)(4n+1)}=\dfrac1{4n-3}-\dfrac1{4n-1}$

Assuming the sum starts at $n=1$ , the $N$ th partial sum is

$\displaystyle\sum_{n=1}^N\left(\frac1{4n-3}-\frac1{4n-1}\right)=\left(1-\frac15\right)+\left(\frac15-\frac19\right)+\cdots+\left(\frac1{4N-7}-\frac1{4N-3}\right)+\left(\frac1{4N-3}-\frac1{4N+1}\right)$
$\displaystyle\sum_{n=1}^N\left(\frac1{4n-3}-\frac1{4n-1}\right)=1-\frac1{4N-1}$

As $N\to\infty$ , you're left with simply 1.

8 0

3 years ago

PLEASEE HELPP MEEEE!!!!!!!!!<br><br> what is the value of x?

Dmitriy789 [7]

Answer:15

Step-by-step explanation:

27+x=42 alternate angles are equal

Collect like terms

x=42-27

x=15

5 0

4 years ago

(a^2-4a+6)+(3a^2+13a-1) finding the sum of the difference

andreev551 [17]

(a² - 4a + 6) + (3a² + 13 - 1)
= a² + 3a² - 4a + 13a + 6 - 1
= 4a² + 9a + 5

Hope this helps! :)

5 0

4 years ago

Write as a monomial in standard form (3a)2

skelet666 [1.2K]

Answer:

I believe it's 6a

6 0

3 years ago

Read 2 more answers

Katarina [22]

12.5 minutes becuase 25ft divided by 2 ft is 12.5

4 0

3 years ago