Help, this is due in 30 mins!

2 answers:

7 0

The computer cost 380 but she made a payment of 130 and got a discount of 30. Firstly take the whole amount which is 380, and subtract 140 from 380 that gets you 240 now subtract (30 dollars the discount) that gets you 210. The question is asking how much does Brenda have left to pay which is 210

Kisachek [45]3 years ago

5 0

Answer:

She needs to pay $20 more.

Step-by-step explanation:

Mothers payment: $360 divided by 2 = $190 left for Brenda

Brenda + discount payments: $190 - $140 = $50

$50 - $30 discount = $20

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Find the sum of the first 8 terms of the series. 1/2 + 1 + 2 + 4

Roman55 [17]

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so as you can see the common ratio is 2, and the first term is 1/2,

$\bf \qquad \qquad \textit{sum of a finite geometric sequence} \\\\ S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ r=\textit{common ratio}\\ ----------\\ r=2\\ a_1=\frac{1}{2}\\ n=8 \end{cases} \\\\\\ S_8=\cfrac{1}{2}\left( \cfrac{1-2^8}{1-2} \right)\implies S_8=\cfrac{1}{2}\left( \cfrac{-255}{-1} \right)\implies S_8=\cfrac{255}{2}$