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g100num [7]
3 years ago
14

Can someone please answer c. I’ve been trying for 30 mins and can’t understand it

Mathematics
1 answer:
nydimaria [60]3 years ago
5 0

Answer: 7

Step-by-step explanation:

For c, we are given this sum from 1 to 3 of \frac{n^2}{2}. 1/2 is a constant , therefore, we can move it outside of the summation.

*I hope you can understand what I'm saying. I can't figure out how to type in summations into the equations section.

1/2∑₁³n²

This means you would multiply the sum of n² from 1 to 3 by 1/2.

We are told n=1 to n=3 so we would plug 1, 2, 3 into n.

1²=1

2²=4

3²=9

We would add them together since that is what the sum sign tells us to do.

1+4+9=14

Now that we know the sum, we multiply it with 1/2

14/2=7

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 Find the equation of the line that is perpendicular to 4 x + 3 y = 5 and goes through the point (3, –3)
Allisa [31]

Step-by-step explanation:

the line equation

y = ax + b

gives us slope (a) and y-interception (b).

4x + 3y = 5

3y = -4x + 5

y = -4/3 × x + 5/3

the slope of the original line is therefore -4/3.

a perpendicular slope flips x and y upside-down and flips the sign.

so, the perpendicular slope of -4/3 is 3/4.

the desired line looks like

y = 3/4 × x + b

b we get by using the given point and its coordinates :

-3 = 3/4 × 3 + b = 9/4 + b

-12/4 = 9/4 + b

b = -21/4

so our full line equation is

y = 3/4 × x - 21/4

or

4y = 3x - 21

-3x + 4y = -21

5 0
2 years ago
-w=-10+4w<br><br> Step by step to please
mylen [45]

w=2

Step-by-step explanation:

-w=-10+4w

10=4w+w

10=5w

10/5=w

2=w

5 0
3 years ago
Read 2 more answers
Which equation is equivalent to the given equation?
anzhelika [568]

Answer:

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The correct answer is option ( B )

Step-by-step explanation:

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4 0
3 years ago
PLEASE HELP THANK YOU SO MUCH
olasank [31]

Answer:

The rocket is 943.9 meters high after 3 seconds

Step-by-step explanation:

h = -4.9t^2 + 298t + 94

t = 0 seconds so it will be 3

h = -44.1 + 894 + 94

h = 943.9 m

8 0
4 years ago
What multiplies to -52 and adds to 9
Goshia [24]
The answer to this is -4 and +13.
When you've got a negative number, this means that only one can be a negative number, and it is usually the smaller one.
-4*13= -52
-4+13= 9

Hope this helps :) 
6 0
4 years ago
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