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olchik [2.2K]
3 years ago
7

X^2-8x-9=0 solve by completing the square

Mathematics
2 answers:
OLEGan [10]3 years ago
8 0

Answer: (x-9)(x+1), so x=9 and x=-1

Step-by-step explanation:

X^2-8x-9=0

-9 times 1 = -9 and -9 plus 1 = -8

So (x-9)(x+1)

X=9, x=-1

MaRussiya [10]3 years ago
5 0
-1 jfbdjebfbhevdibd djfbd
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the total cost of four boxes of pasta is $14 There are 16 oz of pasta in each box of the same amount what is the maximum number
Alja [10]

Answer:

18.5 but rounded to 19 because you cant have half of a box

Step-by-step explanation:

because each box costs 3.5 dollars because i did 1 4 divided by 4.then you want to get to 65 so i did 3.5 divided by 65 then got 18.5 which was rounded because the decimal was big This was the real decimal 18.5714286. THIS MIGHT BE WRONG  

5 0
3 years ago
Can someone help me with this equation?
erastovalidia [21]

Answer:

F = 77

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

3 0
3 years ago
Denise spent $3.45 on snacks every day for 11 days. What is the amount of money Denise spent
musickatia [10]

Answer:

37.95

Step-by-step explanation:

Because 3.45 x 11 is 37.95.

5 0
3 years ago
Read 2 more answers
(2/9) to the power the 3
diamong [38]
The answer is (2/9)^3 = 0.01097 

3 0
4 years ago
Read 2 more answers
Aryiah spent 4 dollars more than Mike. Together they spent 38 dollars. How much did Aryiah spend. Need the equation please
ValentinkaMS [17]

Answer:

<h2>Aryiah spends 21 dollars</h2>

Step-by-step explanation:

       Aryiah and Mike spend some money. Aryiah spends 4 dollars more than what Mike spends. Both together spend 38 dollars.

       Let us denote the amount spent by Aryiah with x and the amount spent by Mike with y. Here x and y are in dollars.

       Aryiah spent 4 more dollars than Mike ⇒ x=y+4

       Both together spend 38 dollars ⇒ x+y=38

Substituting first equation in the second,

y+4+y=38\\2y=38-4=34\\y=17\\x=21

∴ Aryiah spends 21 dollars and Mike spends 17 dollars.

6 0
3 years ago
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