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s2008m [1.1K]
3 years ago
14

Simplify the expression

Mathematics
1 answer:
VLD [36.1K]3 years ago
8 0

Answer:

option A -3r^6 s^14

Step-by-step explanation:

(-3r^4 s^7/r)^2

(-3r^3 s^7)^2

-3r^6 s^14

-TheUnknownScientist

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A bag contains 2 white marbles and 7 purple marbles. Two marbles are drawn at random. One marble is drawn and not replaced. Then
Masja [62]
A.
\frac{7purple}{9total} *  \frac{2white}{8total}  \\  \frac{14}{72}  \\ =0.194
The denominator of the second number goes down one because you aren't replacing the initial marble pulled, making the amount of marbles in the bag go down, but not affecting the white count because you pulled a purple marble.
b.
\frac{2white}{9total} *  \frac{1white}{8total}  \\  \frac{2}{72}  \\ =0.278
The same can be said about the denominator for this problem, but not the numerator. The numerator must go down one number as well, because you already chose one white marble, taking one of the white marbles out of the bag, leaving you with one solitary, white marble.
c.
Chance of selecting two purple marbles:
<u />\frac{7purple}{9total} *  \frac{6purple}{8total}  \\  \frac{42}{72}  \\ =0.583
Chance of selecting two white marbles:
\frac{2white}{9total} * \frac{1white}{8total} \\ \frac{2}{72} \\ =0.278
<u>Chance of selecting two purple</u> vs. <em>Chance of Selecting 2 white:</em>
<u>0.583</u>><em>0.278</em>.
It is more likely to select 2 purple marbles.

Hope this helps!
6 0
3 years ago
Read 2 more answers
Question:
dexar [7]

Hope it helps

\\

<em>~ʆᵒŕ∂ཇꜱꜹⱽẻⱮë</em>

3 0
2 years ago
Lynette is painting a 15-foot by 10-foot rectangular wall that has a 9-foot by 5-foot rectangular window at its center
NikAS [45]
She would paint 105 ft. You do 15 times 10, 150, then subtract 9 times 5, which is 45.
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2 years ago
Please help me, thanks if you do
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Answer:

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It represents the initial number of bacteria to start with. It can represent nothing else.

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12=24-y find yhelp me pleaseee
Reptile [31]

y = 12

Explanation:12\text{ = 24 - y}

We would collect like terms by subtracting 24 from both sides:

12\text{ - 24= 24 - 24 - y}\begin{gathered} -12\text{ = 0 - y} \\ -12=\text{ -y} \end{gathered}\begin{gathered} \text{divide both sides by -1:} \\ \frac{-12}{-1}=\frac{-y}{-1} \\ y\text{ = 12} \end{gathered}

8 0
11 months ago
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