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Harlamova29_29 [7]
3 years ago
11

Erica wants to know how many books on average are in school libraries in her county. She randomly calls 50 school libraries in h

er county and finds out how many books they have. She adds the number of books together and divides by 50. Her conclusion is there are an average of 18,000 books in a school library. Erica's conclusion is A) invalid. Her sample size is too small. B) invalid. Her sample size is too large. C) valid. She used a representative sample. D) bias. She wants schools to buy more new books.
Mathematics
1 answer:
zheka24 [161]3 years ago
3 0
B. is the answer
peace.
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I need help with this promblem it’s ALGEBRA 2!
AlekseyPX

Answer:

(f\circ h)(2)=2

Step-by-step explanation:

<u>Composite Function </u>

Given f(x) and h(x) real functions, the composite function named (f\circ h)(x) is defined as:

(f\circ h)(x)=f(h(x))

It can be found by substituting h into f.

We are given the functions:

f(x)=2x^2-9x+2

h(x)=x^2-4

It's required to find (f\circ h)(2)

As defined above:

(f\circ h)(x)=f(h(x))

Thus:

(f\circ h)(2)=f(h(2))

Find h(2):

h(2)=2^2-4=0

h(2)=0

Now:

(f\circ h)(2)=2(0)^2-9(0)+2

(f\circ h)(2)=2

8 0
3 years ago
Let u = &lt;5, 6&gt;, v = &lt;-2, -6&gt;. Find -2u + 5v.
Hunter-Best [27]
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scalar multiplication, now, add them up
7 0
3 years ago
Read 2 more answers
Least to greatest 3/4, 0.7, 1/2, 0.1
Artyom0805 [142]
( 3/4 =7.5,) 0.7, ( 1/2=0.5,) 0.1 so the correct answer will be ( 0.1, 1/2, 0.7, 3/4
8 0
3 years ago
-26 times a number minus 22 is equal to 90 less than the number.
Novay_Z [31]

-26n -22= n - 90

-26 times a number: -26n

minus 22: -22

equal: =

90 less than a number: n - 90

Solving the Equation:

Move n to the left side of the equal sign (which becomes -n) in order to combine like terms:

-26n-n-22= -90

Move -22 to the right side of the equal sign which becomes +22

-26n-n=-90+22

solve both sides; -26n-n= -27n and -90+ 22= -78

-27n=-78

n= 2.888888

5 0
3 years ago
For the graph y = -8 find the slope of a line that is perpendicular to it and the slope of a line parallel to it. Explain your a
vfiekz [6]

Step-by-step explanation:

The slope perpendicular to it is not defined as it goes infinitely in both sides and the slope parallel to it is 0

6 0
3 years ago
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