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2 years ago

PLS HELP FAST. CORRECT ANSWER WILL BE MARKED BRAINLIEST

Mathematics

1 answer:

Marianna [84]2 years ago

7 0

Answer:

it a or the first one or whatevr u wanna call it jsut #1

Step-by-step explanation:

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What is the sum of the first seven terms of the geometric series where a1 = 10 and r = −2?

matrenka [14]

$Sum_{7} = 10 * \frac{1- (-2^{7}) }{1 - (-2)} = 10* \frac{1+128}{1+2} = 10* \frac{129}{3} = 10 * 43 = 430$

4 0

2 years ago

Give an example of a time when finding the percentage of a number would be useful. Explain.

kupik [55]

When you're out shopping and something you want to buy is on sale. You can take the original price and give it's percentage to find out how much it really is.

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3 years ago

A bank security camera is mounted on a wall. The camera is set at an angle of depression of 19 degrees so that it is focused on

777dan777 [17]

Answer:

8.95feet

Step-by-step explanation:

The set up is a right angled triangle where;

The camera's horizontal distance from the focus point = 26feet = Adjacent;

The height of the camera above the floor = Opposite = x

Angle of elevation = 19°

According to TOA in trig identity;

Tan theta = opp/adj

Tan 19 = x/26

x = 26tan 19

x = 26(0.3443)

X = 8.95feet

Hence the camera is placed at a height of 8.95feet above the floor

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2 years ago

Determine whether the series is convergent or divergent. [infinity] n = 1 1 n√9 the series is a ---select--- p-series with p =

inna [77]

The series is a convergent p-series with p = 3

<h3>How to know it is a divergent or a convergent series</h3>

We would know that a series is a convergent p series when we have ∑ 1 np. Then you have to be able to tell if the series is a divergent p series or it is a convergent p series.

The way that you are able to tell this is if the terms of the series do not approach towards 0. Now when the value of p is greater than 1 then you would be able to tell that the series is a convergent series.

The value of $\sqrt{9}= 3$

The formular for this is

∑ $\frac{1}{n^p} \\$

where n = 1

we know it is convergent because p is greater than 1. 3>1