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3 years ago

What is 0.4 as a percent?

Mathematics

1 answer:

Viefleur [7K]3 years ago

4 0

Answer:40%

.4 is equal to 40%

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At Micaela's Printing Company LLC there are two kinds of penting presses: Model A which can print 60 books per day and Model B w

devlian [24]

A+B=15 —>A+15=B(plug this into the other equation)
60a+30b=600
60a+30(a+15)=600
60a+30a+150=600
90a+150=600
90a=450
A=5 (plug back in to first equation)
A+B=15
5+B=15
B=10

They have 5 of the Model A and 10 of model B.

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2 years ago

Find the sum of the squares of the roots of 3x^2 + 4x + 12 = 0

Contact [7]

Answer:

-56/9

Step-by-step explanation:

Let p and q be the roots of the equation.

So, here's how we're gonna work it out:

${p}^{2} + {q}^{2} = \\ {p}^{2} + {q}^{2} +2 pq - 2pq = \\ ( {p}^{2} +2pq + {q}^{2}) - 2pq = \\ {(p + q)}^{2} - 2pq$

Vieta's formulas give us the sum and the product of the roots of a quadratic equation. Using them we obtain:

p + q = -b / a = - 4 / 3
p × q = c / a = 12 / 3 = 4

${(p + q)}^{2} - 2pq = \\ {( - \frac{ 4}{3} )}^{2} - 2 \times 4 = \frac{16}{9 } - 8 = \\ \frac{16 - 72}{9} = - \frac{56}{9}$

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3 years ago

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AleksAgata [21]

Answer:

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3 years ago

Determine the sample size required to estimate the mean score on a standardized test within 4 points of the true mean with 98% c

Darina [25.2K]

Answer:

Step-by-step explanation:

You have to use fractions to show your work and I'm not going to do that but just know that it is the answer.

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3 years ago

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grandymaker [24]

Answer:

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4 years ago