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Nataliya [291]
3 years ago
11

PLEASE HELP ME! IM ALMOST DONE WITH SUMMER SCHOOL!

Mathematics
2 answers:
dmitriy555 [2]3 years ago
5 0
I think the answer would be A and C
Anestetic [448]3 years ago
4 0
I believe all except b
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Find the coefficient of the x^3 in the expansion of (2x-9)^5
il63 [147K]

Use the binomial theorem:

\displaystyle (2x-9)^5 = \sum_{k=0}^5 \binom5k (2x)^{5-k}(-9)^k = \sum_{k=0}^5 \frac{5!}{k!(5-k)!} 2^5 \left(-\frac92\right)^k x^{5-k}

The <em>x</em> ³ terms occurs for 5 - <em>k</em> = 3, or <em>k</em> = 2, and its coefficient would be

\dfrac{5!}{2!(5-2)!} 2^5 \left(-\dfrac92\right)^2 = \boxed{6480}

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3 years ago
A jet flies over the Air Force Base at 10:20 a.m. At 10:32 a.m., the plane passes over the Navy Base Station, 120 miles away. Ho
kati45 [8]
So first calculate the time between the plane flied over the Air Force Bases (AFB) and Navy Base Station (NBS):
(time passed Air Force Bases) - (time passed Air Force Bases) = 10:32 - 10:20 = 12 mins
Since we know the distance that plane travel from AFB to NBS is 120 miles and the plane traveled that distance within 12 minutes.
We have
120 miles / 12 minutes = 10 miles / minute
Calculate it into miles per hour (60 minutes):
10 miles/minute x 60 minutes = 600 miles per hour.
ANSWER : 600 mph
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4 years ago
Look at the figure. Which step should be taken next to construct a line through point R that is perpendicular to ST ?
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Answer:

where is the figure without figure how to find out

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3 years ago
Helen got a $7 reduction in the price of pair of jeans that are normally $32. What is the aproximate percent decrease In The pri
hjlf
$ 7 dollar reduction....that means new price is (32 - 7) = 25

percent decrease = (original number - new number) / original number..* 100
                                (32 - 25) / 25....* 100
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                                 0.28 * 100
                                 28% decrease <==
6 0
3 years ago
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