Each row of *'s has two more *'s than the row immediately above it
*
***
*****
Altogether, how many *'s are contained in the first twenty rows?

Answers

Answer 1

The first twenty rows contain a total of 400 asterisks.

To find the total number of asterisks (*) in the first twenty rows, we can observe that each row has an odd number of asterisks. The number of asterisks in each row is given by the formula 2n - 1, where n represents the row number.

Using this formula, we can calculate the number of asterisks in each row and sum them up to find the total. Here's the breakdown for the first twenty rows:

Row 1: 2(1) - 1 = 1 asterisk

Row 2: 2(2) - 1 = 3 asterisks

Row 3: 2(3) - 1 = 5 asterisks

Row 4: 2(4) - 1 = 7 asterisks

Row 5: 2(5) - 1 = 9 asterisks

Row 6: 2(6) - 1 = 11 asterisks

Row 7: 2(7) - 1 = 13 asterisks

Row 8: 2(8) - 1 = 15 asterisks

Row 9: 2(9) - 1 = 17 asterisks

Row 10: 2(10) - 1 = 19 asterisks

Row 11: 2(11) - 1 = 21 asterisks

Row 12: 2(12) - 1 = 23 asterisks

Row 13: 2(13) - 1 = 25 asterisks

Row 14: 2(14) - 1 = 27 asterisks

Row 15: 2(15) - 1 = 29 asterisks

Row 16: 2(16) - 1 = 31 asterisks

Row 17: 2(17) - 1 = 33 asterisks

Row 18: 2(18) - 1 = 35 asterisks

Row 19: 2(19) - 1 = 37 asterisks

Row 20: 2(20) - 1 = 39 asterisks

To find the total, we sum up the number of asterisks in each row:

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 + 31 + 33 + 35 + 37 + 39 = 400

Therefore, the first twenty rows contain a total of 400 asterisks.

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Related Questions

the product of 9 and c

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Answer:

The answer is 9c or 9 × c..

2.

Which equation best describes the graph??

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Answer:

y = 3x + 1

Step-by-step explanation:

Laila and Young each made a model volcano. Laila's volcano weighs 3 times as much as Young's. Laila's volcano weighs 9 pounds.
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Step-by-step explanation:

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Answers

Answer:

17 hours

Step-by-step explanation:

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I hope this helps!

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Answers

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m = 4

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I hope this helps!

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Answers

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Step-by-step explanation:

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Answers

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Step-by-step explanation:

Answer:

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1. 1 3/4 + 1/2 + 1/4 + 1/2
2. 5 5/8 - 2 6/7 - 2/7 -5/8
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Answers

yo mama is nice stay safe

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1. 3

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3.8 1/6

Step-by-step explanation:

hope this is correct:)

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The product is .

Answers

Answer:

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Step-by-step explanation:

you make 25 into its perfect square form and multiply

11÷5 x 5 x 5

Write two expressions which are equivalent to 24x + 8.

Answers

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Answers

Answer:

6x(x-4)(x-6)

Step-by-step explanation:

I assume your expression is:

6x^3-60x^2+144x.

I'll use that information.

Factor 6x^3−60x^2+144x

6x^3−60x^2+144x

=6x(x−4)(x−6)

Which expression is equivalent to 1/2b -15?

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B. -1/2 (b - 30)

C. 1/2 (b - 30)

D. 1/2 (b + 30)

Answers

C

Using the distributive property, 1/2(b - 30) would end up being (1/2b) - ((1/2)30). 1/2 times 30 is 15. So 1/2b - 15.

The  expression  1/2b -15 is equivalent to, 1/2(b-30), So option C is correct

What are expressions?

An expression is a sentence with at least two numbers or variables having mathematical operation. Math operations can be addition, subtraction, multiplication, division.

For example, 2x+3

Given that,

An expression,  1/2b -15

The expressions are equivalent = ?

So now, we can take 1/2 common from the expressions

⇒    1/2b -15(2/2)

⇒   1/2(b -15×2)

⇒   1/2(b - 30)  

Hence, the equivalent expression is,  1/2(b - 30)  

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Subtract 1/2h - 1 from 3/4h + 4

A: -1/4h
B: 1/4h + 3
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Answers

Answer:

option d.......................

YEAR 9 MATHEMATUCS ALGEBRA

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Answer:

Your answer is :

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Markn my answer as brainlist . Follow me for more answer.

Step-by-step explanation:

Will Mark brainliest if answer both correctly / What is X= ? / conditional statement

Answers

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Explanation:

For the 1st question:

tan = opposite / adjacent

tan 30 = x / 18

18 tan 30 = x

x = 10.4

For the 2nd question,
If a triangle as an angle of 90 degree, it is 100% a right triangle.

Hope it helps :), mark me brainliest please!

The measures of the angles of a triangle are shown in the figure below.Solve for X

Answers

x=9, all angles will add up to 180. 180-63-38=79. 79=9x-2. 81=9x. divide by 9, x=9.

Help needed ASAP, please!

Answers

Answer:

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(dk if it is)

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Step-by-step explanation:

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Answers

What? I’m confused what your asking.

Answer:

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Inequality Form:

x > −1

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( −1 , ∞ )

Step-by-step explanation:

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Step-by-step explanation:

I person who answers this is right

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Answers

The answer is

[tex]h = - 12[/tex]

it will look like that,.

[tex] \frac{ - 12}{6} - 1 = - 3[/tex]

Answer:

h= -12

Step-by-step explanation:

h/6+1= -3

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h= -12

solve this system of equations by using the elimination method.

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Answers

Elimination method is my favorite way to solve 2 equations like this written in standard form! First I'm going to rewrite the equations and mark numbers to make this explanation more clear.

2x-3y=251️⃣

5x+3y=102️⃣

Looking at these 2 equations we can see that there is a +3 and a -3. This could be eliminated by adding the 2 equations together! *Remember what is on the left side adds with the left side, and what's on the right side adds with the right side. Therefore we can do:

1️⃣+2️⃣

2x-3y+5x+3y=25+10

7x=35

x=5

Then we can substitute the value of x back into either of the 2 equations.

2*5-3y=25

10-3y=25

3y=-15

y=-5

Then write the 2 answers together.

{x=5

{

{y=-5

Now we can check our answers.

2*5-3*-5=10- -15= 10+15=25 Correct

5*5+3*-5= 25+ -15= 10 Correct

From this we can see that x=5 y=  - 5 are the correct answers!

A seventh-grade student wants to read at least 300 pages of a novel this week. He has already read 55 pages. An inequality that represents this situation is 7x+55≥300.

Solve this inequality for x, the number of pager per day.
Identify a number of pages that the student could read per day in order to have at least 300 pages of the novel read in a week.
Explain how you know that your answer is appropriate.
Enter your answer and your work or explanation in the space provided.

Answers

Answer:

x=35

Step-by-step explanation:

7x+55≥300

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--------------------

7x≥245

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ILL GIVE BRAINLIEST FOR FIRST ANSWER HELP


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Answers

Answer:

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Step-by-step explanation:

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Answers

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Answers

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GF GF
is justified as a step in a proof using the Reflexive Property of Congruence
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Step-by-step explanation:

Answer:

reflective property

Step-by-step explanation:

jfjdjdjdjdjfjfjfjfuud

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