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MissTica
2 years ago
9

What is the answer to this 3a^2-9a

Mathematics
2 answers:
olchik [2.2K]2 years ago
4 0
If i'm correct, the answer should be

-3a

hope this helped! 8)

Nikolay [14]2 years ago
3 0

ANSWER:

{3a}^{2}  - 9a \\  =  {( \sqrt{3} a)}^{2}  -  {(3 \sqrt{a}) }^{2}  \\  = using \: formula \:  {a}^{2}  -  {b} = (a + b)(a - b) \\  = ( \sqrt{3} a + 3 \sqrt{a} )( \sqrt{3} a - 3 \sqrt{a} )

HOPE IT HELPED YOU ☺

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Chandler wants to raise 200$ to buy a new gaming system. He already has 80$ and plans to save 40$ a week. How many weeks will it
SashulF [63]

Answer:

<h2>3 weeks</h2>

Step-by-step explanation:

Step one:

given data

expected amount =$200

cash already at hand=$80

savings per week=$40

let the number of weeks be x

Step two:

the linear function for the situation is the same as the equation of a straight line

y=mx+c------1

200=4x+80

solve for x

200-80=40x

120=40x

divide both sides  by 4

x=120/40

x= 3 weeks

<u>Chandler will save for 3 weeks</u>

4 0
2 years ago
Fred and Frank play a game. Fred picks an even number X and asks Frank to add all even numbers between 0 and X (inclusive) as fa
TiliK225 [7]

Answer:

The even numbers between 0 and X represents an arithmetic sequence with a common difference of 2

The rule of arithmetic sequence = a + d(n - 1)

Where a is the first term and n is the number of terms

So, for the even numbers between 0 and X

The first term = a = 0

d = 2

So, we need to find n at the last term which is X

∴ X = 0 + 2 ( n -1 )

∴ n - 1 = X/2

∴ n = X/2 + 1

The sum of the arithmetic sequence = (n/2) × (2a + (n−1)d)

Substitute with a and d and X

So, the sum = (n/2) * (2*0 + (n−1)*2)

                   = (n/2) * ((n−1)*2)

                   = n(n-1)

                   = (X/2 + 1) * (X/2)

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So, The quick way to add all even numbers between 0 and X always works.

8 0
3 years ago
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Mandarinka [93]

Answer: my fingers are broken

Step-by-step explanation:

3 0
2 years ago
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tekilochka [14]
21 divide by 4 is 5.25. She travels 5.25 miles per hour.  42 divide by 5.25 is 8. It would take 8 hours for Shelly to bike 42 miles.
6 0
3 years ago
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AlladinOne [14]

Answer:

answer: 5x + 10

Step-by-step explanation:

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But the problem becomes undone when you forget about the 2. You must multiply the 2 by 5 as well to give 10.

The plus sign cannot be destroyed. The terms are not alike. So the answer is 5x + 10

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3 years ago
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