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Degger [83]
3 years ago
10

How to solve this equation involving radicals. 8x(x – 6)1/2 + 4(x – 6)3/2 = 0

Mathematics
1 answer:
Naya [18.7K]3 years ago
4 0
8x(x - 6)1/2 + 4(x - 6)3/2 = 0
8x(x) - 8x(6)1/2 + 4(x) - 4(6)3/2 = 0
8x² - 48x(1/2) + 4x - 24(3/2) = 0
8x² - 24x + 4x - 36 = 0
8x² - 20x - 36 = 0
x = <u>-(-20) +/- √((-20²) - 4(8)(-36))</u>
                        2(8)
x = <u>20 +/- √(400 + 1152)</u>
                  16
x =<u> 20 +/- √1552</u>
             16
x = <u>20 +/- √(16 × 97)</u>
                16
x = <u>20 +/- √16 √97
</u>               16<u>
</u>x = <u>20 +/- 4 √97
</u>              16
x = <u>20 +/- 4(9.848857802)</u>
                     16
x = <u>20 +/- 39.39543121</u>
                    16
x = <u>20 + 39.39543121</u>        x = <u>20 - 39.39543121</u>
                  16                                        16
x = <u>59.39543121</u>                x = <u>-19.39543121</u>
              16                                         16
x = 3.71221445                  x = -1.212214451
<u />
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Find the radius. Round to the nearest tenth.
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Answer:

Step-by-step explanation:

V = 1/3 * pi * r^2 * h

r = ?

pi = 3.14

h = 17 cm

3*V = pi * r^2 h = r^2    Divide by pi

3*V/pi = r^2 h  = r^2     Divide by h

3*V/(pi*h)         =r^2      Take the square root of the left to get just  r

sqrt(3*V/(pi*h))  = r         Now solve the equation.

sqrt(3*538.25 /(3.14*17)) = r

sqrt(1614 / 53.38) =

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2 years ago
A certain cold remedy has an 88% rate of success of reducing symptoms within 24 hours. Find the probability that in a random sam
Hitman42 [59]

Answer:

The probability of cured people in who took the remedy is 8/9.

Step-by-step explanation:

Success rate of the cold remedy = 88%

The number of people who took the remedy = 45

Now, 88% of 45 = \frac{88}{100}  \times 45 = 39.6

and 39.6 ≈ 40

So, out of 45 people, the remedy worked on total 40 people.

Now, let E: Event of people being cured by cold remedy

Favorable outcomes = 40

\textrm{Probability of Event E}  = \frac{\textrm{Total number of favorable outcomes}}{\textrm{Total outcomes}}

or, \textrm{Probability of people getting cured}  = \frac{\textrm{40}}{\textrm{45}}  = \frac{8}{9}

Hence, the probability of cured people in who took the remedy is 8/9.

3 0
2 years ago
15 point question. please help
uysha [10]
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Brett tallies up the transactions in his check register and comes up with a total balance of $248.53, but his bank statement say
Veseljchak [2.6K]
I'm 100% sure the answer is d. II and IV

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7 0
3 years ago
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Stuart pays back two student loans over a 4-yr period. One loan charges the equivalent of 3% simple interest and the other charg
Ugo [173]

Answer:

The first loan L1 = $20,000

This is the loan with 3% simple interest

The second loan L2 = $4,000

This is the loan with 5.5% simple interest

Step-by-step explanation:

L1 + L2 = $24,000 ...(1)

4(3% of L1) + 4(5.5% of L2) = $3,280 ...(2)

Where the first term in equation (2) represents the total interest paid on loan 1 after 4 years

The second term represents total interest accruing to loan 2 after 4 years

From equation (1), we single out L1

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Substitute this value for L1 in equation (2)

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L2 = $4,000

L1 = $24,000 - $4,000 = $20,000

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