Answer:
C ) For this problem, the mean value of 283 represents the average test score on a mathematics assessment test for eighth-graders.
Step-by-step explanation:
10 th percentile of 232
10 % below 232 and 90 % above 232
25 th percentile of 255
25 % below 255 and 75 % above 255
75 th percentile of 304
75 % below 304 and 25% above 304
90 th percentile of 327
90 % below 327 and 10 % above 327 .
So counting is from below to above in ascending order .
the mean of 283 represents the average of the test score
Hence option C ) is correct .
20. (2) 14
A perfect square trinomial will factor into two expressions that are the same, for example: x^2 + 6x + 9 = (x + 3)(x + 3). Since this problem has a C value of 49, it will factor into (x + 7)(x + 7). 7 doubled is 14, therefore one possible value of B is 7.
21. (4) 2, -12
x^2 + 10x + 25 = 24 + 25
(x + 5)^2 = 49
x + 5 = +/- 7
x = 2, -12
22. (3) 3 + sqrt(17)
x^2 - 6x = 8
Complete the Square
x^2 - 6x + 9 = 8 + 9
(x - 3)^2 = 17
x - 3 = +/- sqrt(17)
x = 3 + sqrt(17), 3 - sqrt(17)
23. (1) 1, -5
x^2 + 4x - 5 = 0
x^2 + 4x = 5
x^2 + 4x + 4 = 5 + 4
(x + 2)^2 = 9
x + 2 = +/- 3
x = 1, -5
Hope this helps!
It’s really blurry can you take a clearer photo
Answer:
b
Step-by-step explanation:
Answer:
224 7/10 is a mixed fraction ..so first we convert it into an improper fraction ...
=> for that follow these steps ...
=> 224 X 10 + 7
=> 2247/10
so now to get in decimals ..we divide 2247 by 10..
=> 224.7 ...
so here we got 224 7/10 in its decimal form ...
Step-by-step explanation:
hope that helps :))