(2 - 7z)(2 + 7z)
= (2)^2 - (7z)^2
= 4 - 49z^2
Answer: 20
Step-by-step explanation:
Given : The orchestra at millard middle school has 120 members.
Of these 17% are eighth grade students.
i.e. Percentage of eighth grade students in orchestra = 17%
Then, the number of eighth grade students in the orchestra. = (Percentage of eighth grade students in orchestra) x ( Total members in orchestra)
= 17% x 120
[We convert % into decimal by dividing it by 100]
[Round to the nearest integer.]
Hence, the estimated number of eighth grade students in the orchestra is 20.
3 is 93 and 4 is -18 i hope this helped
9514 1404 393
Answer:
(a) -4 1/12
(b) -7/12
Step-by-step explanation:
We can convert these numbers to ones with a denominator of 12. This will facilitate the arithmetic.
2 1/3 = (6+1)/3 = 7/3 = 28/12
1 3/4 = (4 +3)/4 = 7/4 = 21/12
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Then the sum and difference are ...
(a) -28/12 -21/12 = -49/12 = -4 1/12
(b) -28/12 +21/12 = -7/12