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3 years ago

7

Dupa doua reduceri consecutive de pret , ambele de 10% , un aparat foto costa 567 lei. care a fost pretul initial al aparatului

foto.

1 answer:

mestny [16]3 years ago

6 0

Raspunsul e pe foaie

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Solve each proportion 3/39= y/13

Sphinxa [80]

Answer:

$y = 1$

Step-by-step explanation:

$\frac{3}{39} = \frac{y}{13}$

Cross multiply

$39 = 39y$

Divide by 39

$y = 1$

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2 years ago

Read 2 more answers

Follow the process of completing the square to solve x^2 - 10x + 8 = 0. What is the value of the constant that will be isolated

My name is Ann [436]

To solve using completing square method we proceed as follows:
x^2-10x+8=0
x^2-10x=-8
but
c=(b/2)^2
c=(10/2)^2=25
thus we can add this in our expression to get
x^2-10x+25=8+25
factorizing the LHS we get:
(x-5)(x-5)=33
(x-5)^2=33
getting the square roots of both sides we have:
x-5=+/-√33
x=5+/-√33

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3 years ago

Read 2 more answers

HELP ME I NEED HELP QUICK

vova2212 [387]

Answer:

C

Step-by-step explanation:

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3 years ago

Jon borrows $4.50 from his friends to pay for his snacks, and $13.65 from his sister to go to the movies. How much money does he

yarga [219]

Answer: $18.15

Step-by-step explanation:

$ 4.50 + $13.65 = total amount due

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3 years ago

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.3 days and a standard de

inna [77]

Answer:

<em>The probability of spending between 4 and 7 days in recovery</em>

<em>P(4≤x≤7) = 0.5445</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given mean of the Population μ = 5.3 days

Given standard deviation of the population 'σ' = 2 days

Let 'X' be the random variable in normal distribution

Let x₁ = 4

$Z_{1} = \frac{x_{1}-mean }{S.D} = \frac{4-5.3}{2} = -0.65$

Let x₂ = 7

$Z_{2} = \frac{x_{2}-mean }{S.D} = \frac{7-5.3}{2} = 0.85$

<u><em>Step(ii):-</em></u>

<u><em>The probability of spending between 4 and 7 days in recovery</em></u>

<em>P(4≤x≤7) = P(-0.65≤Z≤0.85)</em>

<em> = P(Z≤0.85) - P(Z≤-0.65)</em>

<em> = 0.5 + A( 0.85) - ( 0.5 - A(-0.65) </em>

<em> = 0.5 + A( 0.85) - 0.5 +A(0.65) ( ∵A(-0.65) = A(0.65)</em>

<em> = A(0.85) + A(0.65)</em>

<em> = 0.3023 + 0.2422</em>

<em> = 0.5445</em>

<u><em>Final answer:</em></u><em>-</em>

<em>The probability of spending between 4 and 7 days in recovery</em>

<em>P(4≤x≤7) = 0.5445</em>

<em> </em>

6 0

3 years ago