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Reptile [31]
3 years ago
7

Over the summer, Delilah collected 75 books from her personal library that she had outgrown. She decided to donate them to the m

iddle schools in her city. She’s going to give 20 books to the middle school she attended and give each of the other schools in her city an equal share of the remaining books. If each of the other schools received 11 books, how many total schools did Delilah donate to
Mathematics
2 answers:
marishachu [46]3 years ago
8 0

Answer:

Over the summer, Delilah collected 75 books from her personal library that she had outgrown. She decided to donate them to the middle schools in her city. She’s going to give 20 books to the middle school she attended and give each of the other schools in her city an equal share of the remaining books. If each of the other schools received 11 books, how many total schools did Delilah donate to? Really who cause I dont know

Step-by-step explanation:

shepuryov [24]3 years ago
3 0

Answer:

she donated 9 books to hers

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Add means you combine things..to make the amount larger

Step-by-step explanation:

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earnstyle [38]

Answer:

x = 10/7 or x = -10/7

Step-by-step explanation:

By using the completing the squares method, we have to divide the coefficient of the x term by 2, square it and add to both sides

From what we have here, the coefficient of the x term is 0

Thus, we have it that;

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We can proceed to use the difference of two squares here;

Whereby;

a^2 - b^2 = (a-b)(a + b)

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3 years ago
Assume the heights in a female population are normally distributed with mean 65.7 inches and standard deviation 3.2 inches. Then
siniylev [52]

Answer:

0.620

Step-by-step explanation:

We know that 1 feet = 12 inches, so, 5 feet is equivalent to 60 inches. Then, we are looking for the probability that a typical female from this population is between 60 inches and 67 inches. We know that

\mu = 65.7 inches and

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and the normal density function for this mean and standard deviation is

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\int\limits^{67}_{60} {\frac{1}{\sqrt{2\pi } 3.2}exp[-\frac{(x-65.7)^{2}}{2(3.2)^{2}} ] } \, dx =0.620

You can use a computer to calculate this integral. You can use the following instruction in the R statistical programming language

pnorm(67, 65.7, 3.2)-pnorm(60, 65.7, 3.2)

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3 years ago
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artcher [175]

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