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3 years ago

Help me please. 50 points!

Mathematics

2 answers:

natima [27]3 years ago

7 0

Answer:

B for sure!

Step-by-step explanation:

jekas [21]3 years ago

3 0

Answer:

Step-by-step explanation:

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Factor 16xy^2-24y^2z+40y^2

qaws [65]

Answer:

8y^2(2x_3z+5)

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3 0

3 years ago

Pls help asapppppppp

denis23 [38]

Answer:

Step-by-step explanation:

5 0

2 years ago

A music store owner noted that CD sales had dropped 33% from one quarter to the next. If the owner sold 579 units in the first q

Paul [167]

Answer: 387.93 units

Step-by-step explanation:

You have the following information given in the problem above:

- The sales had dropped 33% from one quarter to the next.

- The owner sold 579 units in the first quarter.

Thefore, to calculate the number of units she sold in the next quarter (which you can call x), you must can apply the following proccedure:

$x=579units-(0.33)(579units)$

Then the answer is the following:

$x=387.93units$

4 0

2 years ago

Using the Law of Cosines, in triangle DEF, if e=18yd, d=10yd, f=22yd, find measurement of angle D

Ivahew [28]

Check the picture below.

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}=cos(C)\implies cos^{-1}\left(\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}\right)=\measuredangle C\\\\
-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
f=22
\end{cases}\implies cos^{-1}\left(\cfrac{{{ 18}}^2+{{ 22}}^2-10^2}{2(18)(22)}\right)=\measuredangle D$

$\bf \implies cos^{-1}\left(0.893\overline{93}\right)=\measuredangle D\implies 26.63^o\approx \measuredangle D$

7 0

3 years ago

The first term of geometric sequence is 7 and the common ratio is -2. Find the 9th term.

kobusy [5.1K]

$a_{1}$ = 7.

Ratio means multiply/divide.
To get the next number, multiply number by common ratio.
To get a previous number, divide by common ratio.

Since we want the next number...
2nd term: 7 x -2 = -14
3rd term: -14 x -2 = 28
4th term: 28 x -2 = -56
5th term: -56 x -2 = 112

Keep going until 9th term!

5 0

3 years ago