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____ [38]
3 years ago
12

Use the summation formula to find a partial sum of a series with the following properties

Mathematics
1 answer:
Otrada [13]3 years ago
4 0

Answer:

-36,047.

Step-by-step explanation:

Sum of n terms =  a1 .( r^n - 1) / (r - 1)

So Sum of 7 terms =  -11 . ((-4)^7 - 1 / (-4-1)

= -11 *  -16,385 / -5

= -36,047.

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The price of a flight was increased by 3% to £650. What was the price before the increase?
liubo4ka [24]

Answer:

£ 631

Step-by-step explanation:

Hi this is a simple mathematics issue.

First, let's imagine what is 3%. '3 percents' means 3/100. If your family have 100 apples and you have 3 apples, that means you have 3% of your family apples.

Now, get back to this problem. We need to find the price before increase. Let's say the price was £ X. Now we will find the X number.

It's said that the price was increased by 3%. That means they took 3% of X and added that amount to X to have the new price : £ 650. That means we have this equation :

650 = X + 3%×X

Let's make it easier to look :

650 = X + 3/100 ×X

650 = X×( 1+ 3/100)

= X × 103/100

So we can see 650 is equaled to X multipled by 103/100.

To find the correct answer, simply divide 650 by 103/100.

*A hint: When you divide a number by a fraction, you can simply put the number multiplied by the "flipped" fraction .

Hope you learn with Joy and High Grades !!!

8 0
3 years ago
Ava is saving for a new computer that coat 1,218 she already has half saved of the money. Ava earns $14.00 per hour. How many ho
ollegr [7]

Answer:

43.5

Step-by-step explanation:

First

1218 divided by 2

= 609

Second

609 divided by 14 is =43.5

43.5 is the answer

4 0
3 years ago
Which is not a quadrilateral?
ddd [48]

Answer:

triangle

Step-by-step explanation:

it has 3 sides, not four

5 0
3 years ago
Janet has $120. If she saves$20 per week, in how many days will she have $500?
maxonik [38]
She will have $500 in 5 days because when she takes out the 20 every week she will have had $100 so to make $500 she will have to have made 5 $100
8 0
4 years ago
What is the following product? Assume b>0
goldenfox [79]
I’m sorry, need more information
6 0
3 years ago
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