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April 25, 2015

Posted by **Jab** on Thursday, October 6, 2011 at 6:05pm.

5. Business B pledged $20 million less

than twice the amount pledged by

Business A. Business C pledged $200

million less than twice the amount

pledged by Business B. If x represents

the amount pledged by the Business A,

write expressions to show the amounts

pledged by Business B and Business C

in terms of x.

6. The combined pledges of Business A,

Business B, and Business C totaled

$1035 million. Write an equation that

can be used to determine how much

each business pledged.

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3. PYRAMIDS When climbing an ancient

Mayan pyramid, the Johnson family

noticed that the bottom of each side of

the pyramid started with 50 large

stones. The next step up had 45 large

stones, the next step up had 40 stones,

and so on. Write an equation to

represent the number of stones on each

level. How many levels can the pyramid

have?

Steps 1 = 45 stones

Steps 2 = 40 stones

Steps 3 = 34

?

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TRIANGULAR NUMBERS By arranging

bowling pins in their proper order, a

triangle is created. The table below

shows the number of rows of bowling

pins and the total number of pins in the triangle. The formula:

n * (n+1) / 2

can be used to find t, the total number of items in n rows. How many bowling pins would there be if 10 rows of pins were set up?

Rows 1 2 3 4

Pins 1 3 6 10

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PASCAL’S TRIANGLE For Exercises 5 and

6, use the following information.

Blaise Pascal is known for a special

triangular arrangement of numbers, calledPascal’s Triangle.. Each number insuccessive rows of the triangle is created by adding the two numbers in the row above the number.

1

1 1

1 2 1

1 3 3 1

1 4 6 4 1

1 5 10 10 5 1

5. Starting with the second row from thetop, what is the sequence of the diagonal

(1 2 3 4 5 6 7)?

6. The sum of each row represents 2n,

starting with the first row, which is

20 = 1. Write an exponential expression

for the sum of the values in the sixth

row. Simplify the expression.

- Algebra - Grade 9 -
**Mrs. Gample**, Thursday, October 6, 2011 at 6:08pmid be glad to check your answers if you showed the work that you tried and the answer you think is correct

- Algebra - Grade 9 -
**Jab**, Thursday, October 6, 2011 at 6:09pmFor 5 & 6. Business I have no clue where to start. :{

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4. TRIANGULAR NUMBERS I tried this:

t= 10x(10+1)

t= 10x(11)

t= 110/2 = 55

but this also looks wrong and doesn't seem right.

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Again with PASCALS TRIANGLE 6 I have no idea where to start.

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

With 3 PYRAMIDS i tried this:

45-5 (1-9)

45-5 (8)

45+40

= 85

Also it appears wrong.

- Algebra - Grade 9 -
**Jab**, Thursday, October 6, 2011 at 6:18pmPlease. I am having extreme difficulties with this :(

- Algebra - Grade 9 -
**T U BHARGAV**, Wednesday, October 12, 2011 at 11:17amanswer for,5. Business B pledged $20 million less

than twice the amount pledged by

Business A. Business C pledged $200

million less than twice the amount

pledged by Business B. If x represents

the amount pledged by the Business A,

write expressions to show the amounts

pledged by Business B and Business C

in terms of x. is

A=x

B=2X-20

C=4X-240