A polynomial is factored using algebra tiles.
2 answers:
Answer:
B.(x + 1) and (x − 3)
Step-by-step explanation:
The upper side of the tiles show the expression (x + 1), and the left side shows the expression (x - 3) (see figure attached). In both cases, you have to consider how many +x or -x are (one +x in one case and three -x in the other case). If you multiply the factors, you get:
(x + 1)*(x - 3) = x^2 - 3x + x - 3
which is the expression made by all the tiles.
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Answer:
Option (b) 36.7
Step-by-step explanation:
Data provided in the question:
Treatment 1 Treatment 2 Treatment 3 Treatment 4
Sample Size 50 18 10 17
Sample Mean 32 36 42 48
Now,
The overall mean is calculated as
=
Here, Xi = Sample mean
n = sample sizes
Thus,
Overall mean
= [ (50 × 32) + (18 × 36) + (10 × 42) + (17 × 48) ] ÷ [ 50 + 18 + 10 + 17 ]
= [ 1600 + 648 + 420 + 816 ] ÷ 95
= 36.67 ≈ 36.7
hence,
Option (b) 36.7