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2 years ago

Find s7 for 3 8 13 18

2 answers:

7 0

I know u are supposed to use formulas to do this...but it is just as easy to do it this way...that is, if u dont have many numbers...if u were looking for s20, we would have used formulas...lol
u will notice that in ur pattern, their is a difference of 5 between each number....this is an arithmetic sequence

start at 3
3 + 5 = 8
8 + 5 = 13
13 + 5 = 18
18 + 5 = 23
23 + 5 = 28
28 + 5 = 33
thats ur first 7 numbers...so just add them and u will have s7
s7 = 126

sergij07 [2.7K]2 years ago

4 0

Answer:

126

Step-by-step explanation:

Given sequence is 3,8,13, 18..........

We need to find the sum of 7 terms s7

Sum formula is $S_n=\frac{n}{2} (2a+(n-1)d)$

Where 'a' is the first term and 'd' is the difference

Difference of two terms is 8-3=5, 13-8= 5

d=5 and a=3

To find s7 , the value of n=7

$S_7=\frac{7}{2} (2(3)+(7-1)5)=126$

The sum of 7 terms = 126

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A random number from 1 to 5 is selected

shutvik [7]

Answer:

Relative frequency of selecting a 2 = 8/50 = 0.16

Relative frequency of selecting a 3 = 14/50 = 0.28

Step-by-step explanation:

When we have a given experiment with given outcomes (such that each time that we perform the experiment, one outcome happens) the relative frequency of a given outcome is the quotient between the number of times that that outcome happened, and the total number of times that the experiment was performed.

Here the experiment is selecting a random number between 1 and 5, and it is performed 50 times.

Out of these 50 times, the outcome "2" appears 8 times.

Then the relative frequency of selecting the number 2 is:

f(2) = 8/50 = 0.16

And of these 50 experiments, the outcome "3" appears 14 times.

Then the relative frequency of selecting the number 3 is:

f(3) = 14/50 = 0.28

7 0

3 years ago

Evaluate the given expression if x = 25, y = 10, w = 11, and z = 18.<br><br> (see the image)

hammer [34]

Answer:

Step-by-step explanation:

So we have the expression:

$(x-y)^2+10wz$

And we want to evaluate it when x=25, y=10, w=11, and z=18.

So, substitute these values for the variables:

$=(25-10)^2+10(11)(18)$

First, subtract within the parentheses:

$=(15)^2+10(11)(18)$

Square 15:

$=225+10(11)(18)$

Now, multiply the terms on the right. 10 times 11 is 110:

$=225+110(18)$

Multiply:

$=225+1980$

Finally, add:

$=2205$

So, our answer is D.

And we're done!

8 0

3 years ago

Read 2 more answers

What number gives a result of −4 when 10 is subtracted from the quotient of the number and 4?

Arisa [49]

Answer:

Step-by-step explanation:

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2 years ago

Explain how to solve the following system of equations. what is the solution to the system? 2x+2y+z =-5

Travka [436]

Please insert your equation number

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3 years ago

Find the lateral surface area.

sveta [45]

Answer:

900 yd²

Step-by-step explanation:

You can draw the pattern that would need to be folded to make the figure, then find the area of that pattern (or "net"). It consists of a rectangle 10 yards wide and 60 yards long, together with another that is 20 yards long and 15 yards wide. The total area is the sum of these ...

... area = (60 yd)(10 yd) + (20 yd)(15 yd)

... = 600 yd² +300 yd²

... = 900 yd²

5 0

3 years ago