3 years ago

How can i plus and subtract fractions

Mathematics

1 answer:

Alexandra [31]3 years ago

8 0

You would have to find a common denominator

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Find the sum of a finite geometric sequence from n=1 to n=8, using the expression -2(3)^n-1

MissTica

$\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}
\end{cases}
\\\\\\
\sum\limits_{n=1}^{8}~-2(3)^{n-1}~~
\begin{cases}
n=8\\
a_1=-2\\
r=3
\end{cases}\implies S_8=-2\left( \cfrac{1-3^8}{1-3} \right)
\\\\\\
S_8=\underline{-2}\left( \cfrac{1-6561}{\underline{-2}} \right)\implies s_8=1-6561\implies S_8=-6560$

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3 years ago

The cost of a taxi ride includes an initial charge of $2.00. If a 5km ride cost $6.00 and 10km ride cost $10.Oo, determine the c

romanna [79]

Answer:

5km costs $4

if you take the intial charge of $2, you're paying $4 per 5km

hence 10km= 2 *5km= 2*$4=$8+initial charge $2= $10

15Km= 3*5km= 3*$4= $12 + intial charge $2 = $14

Step-by-step explanation:

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3 years ago

Can someone please help? i’ll mark brainliest!!

Liono4ka [1.6K]

Answer:

z+5 z+2 Z i think

Step-by-step explanation:

the lenght is longer to shorter

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24/25

Step-by-step explanation:

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Determine if the set is a Pythagorean triple

balandron [24]

Answer:

Pythagorean Triples are sets of whole numbers for which the Pythagorean Theorem holds true. The most well-known triple is 3, 4, 5. This means that 3 and 4 are the lengths of the legs and 5 is the hypotenuse.

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