Mathematics High School

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


can someone solve this please , ill give Brainly to whoever is first :)

Answers

Answer:

630 in^2

Step-by-step explanation:

21 x 15 divided by 2 = 157.5

157.5 x 4 = 630

Answer:

Step-by-step explanation:

I person who answers this is right

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

    -55 -55

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

7x≥245

now divide both sides by 7

x=35

A blueprint for a new triangular playground shows that the sides
measure 480 ft, 140 ft, and 500 ft. Is the playground in the shape of
a right triangle? Explain.

Answers

Answer:

no

Step-by-step explanation:

because it is not equal numbers

find the value of X ​

Answers

your answer would be 68

YEAR 9 MATHEMATUCS ALGEBRA

Answers

Answer:

Your answer is :

B. 6a^2 + 3ab

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

Step-by-step explanation:

GF GF
is justified as a step in a proof using the Reflexive Property of Congruence
Choose...
Alternate Interior Angles Theorem
Hypotenuse-Leg Theorem
Reflexive Property of Congruence
ASA Triangle Congruence Theorem

Answers

Answer:

Reflexive property of congruence.

Step-by-step explanation:

Answer:

reflective property

Step-by-step explanation:

jfjdjdjdjdjfjfjfjfuud

Are the ratios 2:3 and 3:2 equivalent?
Yes
No

Answers

Answer:

no

Step-by-step explanation:

Answer:

no , they not equal they are different

Help needed ASAP, please!

Answers

Answer:

percent 60%

fraction 60/100

ratio 60:40

(dk if it is)

Answer: 60% fraction: 6/10 ratio: 6:10

Step-by-step explanation:

the product of 9 and c

Answers

Answer:

The answer is 9c or 9 × c..

Jan wants a bunch of balloons for her birthday party. There were 10 red, 12 blue, 13 green and 15 yellow balloons. What percentage is the blue balloons ?

Answers

Answer:

Should be 24%

Step-by-step explanation:

12/50= .24

h/6-1=-3 h=?


please help​

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

h/6= -2

h= -12

What is the value of Fraction 1 over 2 x3 + 3.4y when x = 3 and y = 4? (4 points)15.85 18.1 27.1 31.6

Answers

The correct answer is 27.1

2.

Which equation best describes the graph??

y = 3x + 1
y = -3x + 1
y = -3x - 1
y = 3x - 1

Answers

Answer:

y = 3x + 1

Step-by-step explanation:

Evaluate the expression for p = 9!

Answers

Answer:

362880

Step-by-step explanation:

P=3.14 and 3.14 times 9 equals 28.26

Debra made $228 for 12 hours of work.
At the same rate, how many hours would she have to work to make $323?

Answers

Answer:

17 hours

Step-by-step explanation:

Set up a proportion: [tex]\frac{12}{228} = \frac{x}{323}[/tex]  Cross multiply, then divide: 12 × 323 = 3876, 3876 ÷ 228 = 17So, she would have to work 17 hours to make $323.

I hope this helps!

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

Answers

The answer is for 1st question is “10.4” and for the second question “non of these choices are correct”.

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.

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

A: -1/4h
B: 1/4h + 3
C: -1/4h + 5
D: 1/4h + 5

Answers

Answer:

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

17x>−17.................

Answers

What? I’m confused what your asking.

Answer:

Divide each term in 17x > −17 by 17.

17x/17 > −17/17

Cancel the common factor of 17.

x > −17/17

Divide −17 by 17.

x > −1

The result can be shown in multiple forms.

Inequality Form:

x > −1

Interval Notation:

( −1 , ∞ )

Step-by-step explanation:

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

A. -1/2 (b + 30)

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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solve this system of equations by using the elimination method.

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

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!

How do you write 6x (to the 3rd power) -60x (to the 2nd power) +144x in factored form?

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)

I hate mathhhhhhhhhhh

Answers

Answer:

dont we all

Step-by-step explanation:

Answer:

r is a variable, 3/5 is a constant, 1 and 1/4 is a coefficient

Use the Distributive Property to find the product.

1 1/5x25=?

The product is .

Answers

Answer:

55

Step-by-step explanation:

you make 25 into its perfect square form and multiply

11÷5 x 5 x 5

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.
How much does Young's volcano weigh?
A3 pounds
B. 6 pounds
c 12 pounds
D. 18 pounds
E 27 pounds

Answers

Answer:

3

Step-by-step explanation:

The answer to this question is A

What is the slope between:
(2,5) (4, 13)

Answers

Answer:

m = 4

you can find the answer for this on m a t h w a y (without the spaces)

I hope this helps!

Answer:

4

Step-by-step explanation:

slope = y2-y1 / x2-x1

13-5= 8

4-2=2

8/2= 4

Determine if it’s relationship is a function.

Answers

Answer:

It is not a function

because: 4: 25 went to 4: 35

an input can not have two or more outputs

Step-by-step explanation:

1. 1 3/4 + 1/2 + 1/4 + 1/2
2. 5 5/8 - 2 6/7 - 2/7 -5/8
3. 9 5/6 + 1 1/4 + ___ = 14
Please answer these and help me!!!

Answers

yo mama is nice stay safe

Answer:

1. 3

2. 1 6/7

3.8 1/6

Step-by-step explanation:

hope this is correct:)

ILL GIVE BRAINLIEST FOR FIRST ANSWER HELP


What is the volume of this rectangular prism?

Answers

Answer:

The answer is 56 cm^3

Step-by-step explanation:

2 = height

7 = length

4 = width

Formula: LxWxH

2 x 7  x 4 = 56

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

Answers

[tex]8(3x + 1)[/tex]

Factor out 8 from the expression

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