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ELEN [110]
3 years ago
8

What number should be added to both sides to complete the square? x^2 + 8x = 4

Mathematics
1 answer:
son4ous [18]3 years ago
8 0

Answer:

16

Step-by-step explanation:

x² + 8x = 4 ⇔ x² + 8x + 16 = 4 + 16 ⇔ x² + 2×4x + 4² = 20 ⇔ (x + 4)² = (2√5)²

Remark : (2√5)² = 20

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kogti [31]

Answer:

D

Step-by-step explanation:

I'm not certain but I guess that's it

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3 years ago
Which graph shows a dilation of the triangle with a scale factor of 3
8090 [49]

I'd say the 3rd one. I haven't done this stuff in 2 years ... me forgot. But if it's not right, then the 1st one!

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3 0
3 years ago
Read 2 more answers
Please help! Thank you!
Aloiza [94]

Answer:

X=sigma xi/no of observation

5= (?) /4

5*4=sum of all numbers

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3 years ago
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Rama09 [41]

(k-7) would be the equation

6 0
3 years ago
A newspaper editor starts a retirement savings plan in which $225 per month is deposited at the beginning of each month into an
qwelly [4]

Answer: the value of this investment after 20 years is $112295.2

Step-by-step explanation:

We would apply the formula for determining future value involving deposits at constant intervals. It is expressed as

S = R[{(1 + r)^n - 1)}/r][1 + r]

Where

S represents the future value of the investment.

R represents the regular payments made(could be weekly, monthly)

r = represents interest rate/number of interval payments.

n represents the total number of payments made.

From the information given,

Since there are 12 months in a year, then

r = 0.066/12 = 0.0055

n = 12 × 20 = 240

R = $225

Therefore,

S = 225[{(1 + 0.0055)^240 - 1)}/0.0055][1 + 0.0055]

S = 225[{(1.0055)^240 - 1)}/0.0055][1.0055]

S = 225[{(3.73 - 1)}/0.0055][1.0055]

S = 225[{(2.73)}/0.0055][1.0055]

S = 225[496.36][1.0055]

S = $112295.2

7 0
3 years ago
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